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Constant network issues

I am on my 3rd device in 3 days. First one was rooted, second one was not. This current one is also not rooted as well.
Unless I am very unlucky, I am going to assume there is a definite issue with the network configuration on this device. Status says I have 3 bars of 4G coverage, however I cannot connect to the internet at all.
Network Signal Info says I am on UMTS with a -93DBM, data is connected. However nothing will load. If I put the phone into airplane mode and then turn airplane mode off the networking comes back online. Speeds are slow though, barely able to perform basic mobile web browsing and watching youtube and such isnt possible. Too slow an too long to buffer.
This doesn't only happen at my house, it happens in other areas as well but it does happen constantly at home. I a not a heavy data user on my account, 1-2GB monthly, so Tmo says they arent throttling me. They have replaced the SIM every time with the devices as well.
Suggestions? If I cannot figure this out soon I am going to cancel my service as I cannot pay for a service and phone that just doesnt work. Tmo seems stumped. They just keep replacing phones since I am within my 14 day return/exchange period.
However, 3 devices all having the same issues sure seems to either prove the phone has an issue, or m general area of Tmo service.
I live in downtown Tempe, AZ.

Your wifi works?
I have the same issue in my house... I have a weak signal and 4g drops down to 2g which is terrible.... 4g downloads are 3Mbps, but uploads are under 100kps
I changed the network mode to wcdma only which helps significantly. 4g drops, but quickly returns...
Give it a try...

I'm having the same issue here in Orlando. I've had 2 phones now (first one was just a bad unit) and both have had horrible network connectivity and reception. I take my SIM card out and put it in my 2 year old MT3G and it gets perfect reception and fast data transfers while the G2x is choking on network transfers.

Go complain here in LG forum. This is software issue.
http://www.lgforum.com/forum/boards/general/lg/topics/g2x-wifi-problems

have full bars but cant download anything. just sits at waiting for data connection.

We really need a baseband modem that works better. My bars goes to zero then to edge and then to 3g constantly. Any time it switches between the connections then the the bars goes to zero and it says there is no conection. Also noticed that 3g connection fluctuates very bad while doing a speed test.
Sent from my LG-P999 using XDA App

ceroglu said:
We really need a baseband modem that works better. My bars goes to zero then to edge and then to 3g constantly. Any time it switches between the connections then the the bars goes to zero and it says there is no conection. Also noticed that 3g connection fluctuates very bad while doing a speed test.
Sent from my LG-P999 using XDA App
Click to expand...
Click to collapse
How are you getting 3g? Unless you meant to say 4g?

himmelhauk said:
How are you getting 3g? Unless you meant to say 4g?
Click to expand...
Click to collapse
T-mobile only has 3g connection avaliable where I live, of course it says 4g on the phone but in reality it is only 3g.

ngerasimatos said:
I am on my 3rd device in 3 days. First one was rooted, second one was not. This current one is also not rooted as well.
Unless I am very unlucky, I am going to assume there is a definite issue with the network configuration on this device. Status says I have 3 bars of 4G coverage, however I cannot connect to the internet at all.
Network Signal Info says I am on UMTS with a -93DBM, data is connected. However nothing will load. If I put the phone into airplane mode and then turn airplane mode off the networking comes back online. Speeds are slow though, barely able to perform basic mobile web browsing and watching youtube and such isnt possible. Too slow an too long to buffer.
This doesn't only happen at my house, it happens in other areas as well but it does happen constantly at home. I a not a heavy data user on my account, 1-2GB monthly, so Tmo says they arent throttling me. They have replaced the SIM every time with the devices as well.
Suggestions? If I cannot figure this out soon I am going to cancel my service as I cannot pay for a service and phone that just doesnt work. Tmo seems stumped. They just keep replacing phones since I am within my 14 day return/exchange period.
However, 3 devices all having the same issues sure seems to either prove the phone has an issue, or m general area of Tmo service.
I live in downtown Tempe, AZ.
Click to expand...
Click to collapse
I wonder if there is an issue with our network in Arizona?? I live in Chandler, and work in Scottsdale. my data times out ALLL THE TIME. Both here at home, and at work. Same with my text messaging. Literally, I do exactly what you do with the "airplane" mode. That's the only way to get my data and text working again (besides restarting).
Here are the issues I posted in the LG Forum:
http://www.lgforum.com/forum/boards/carriers/t-mobile/topics/few-issues-with-g2x#26861
(first issue posted is what you are talking about)

I dont think this is a regional issue. Downtown Minneapolis here, and I cant get it to stay on wifi or Edge/4g for more than a few minutes at a time. G1 has no trouble and shows strong 3g while my sisters mt4g shows full 4g. 4g/E symbol just flickers on my g2x leaving me with no connection. I can connect to wifi fine, but even with wifi sleep set to never it still disconnects every few minutes, and has to be toggled on/off to reconnect. Until toggling it just sits flickering 4g/E with no data connection.
I've never seen my Evo drop a E/4g/wifi connection and struggle to reconnect once in the year I've had it. My g2x does it almost every time I pick it up.

Did you try going into Mobile Networks in Settings and changing the mode to WCDA Preferred or something? That'll stop the flip flopping. That's what I have it on and that's what the phone came with out of the box.Also try Auto in that menu.

4G LTE Data Connection "Stall"

So I have a perfectly good 4G LTE signal going, data speeds are great and all, but every once in a while it will just stop receiving data. The 4G LTE icon is still there, occasionally I see the upstream arrow flash, but the downstream arrow remains blank. A difference that I see from other people's connectivity issues is that I never once see it switch to 3G/1X when this happens.
One thing to note is that this behavior is not readily apparent until you're doing something real-time network dependent, like streaming audio/video for a considerable duration of time until it cuts you off suddenly.
Between 10 seconds to several minutes after data stops transmitting, it starts working again. Sometimes I get impatient and just toggle between CDMA only/LTE automatic to get 4G LTE working again without having to wait.
Is this a common issue among Charge owners? I noticed the reviewer at Anandtech had a near identical experience (though not always fixable without a reboot for him):
"My only complaint is that every once in a while, the LTE data session sometimes stalls briefly – sometimes for a a few seconds, other times for a few minutes. When that happens, you’ll see the uplink green arrow blink, but no orange downlink arrow. Rebooting the device fixes things."
Click to expand...
Click to collapse
After conversing a bit with him (he also reviewed the Thunderbolt/Revolution), this apparently only happens with the Charge, but he also has faith that Samsung would fix this through software (RIL) or hardware (firmware). Given Samsung's track record with smartphone updates, I'm not so sure they will.

PeterDLai said:
Given Samsung's track record with smartphone updates, I'm not so sure they will.
Click to expand...
Click to collapse
Considering a month after the phone's launch we already have a Gingerbread leak I think this device will most definitely see support from Samsung. It is a DROID branded phone after all, and Verizon is statistically the best carrier for updates, they do take special care of the "DROID" phones over every other Android handset.

4G is flakey, on both devices that offer it. I have both the Thunderbolt and Charge with me most of the time, and I see all kinds of flakiness on both. It's the network.

It is definitely the network. I had a Thunderbolt before the Charge and it was FAR worse with network connectivity falling off the face of the planet despite having full 3g/4g.
Sent from my SCH-I510 using Tapatalk

I have had the same problem. I usually wait and it comes back in about 30-45 seconds, but it is annoying. It was really bad for a couple of days but has been better the past couple.

I personally haven't had to much issue with 4g dropping out. However people need to keep in mind that LTE is new for both the mfgs & carrier. So it is going to take time to get all these bugs worked out. That said I have to give props to VZW and the mfgs tho because back when they were building out 3G originally you want to talk about issues my lord was it bad.

I have had this issue, with the 3G and the 4G, but I can't say that it's a deal breaker for me, compared to the lousy HSPA+ signal my Vibrant had. It's only ever happened to me at my house, which is right on the edge of LTE coverage, so it switches back and forth a lot. But I have to give the network the benefit of the doubt for right now, it's a brand new network and a brand new device. And the 97% of the time that things work properly, it's so far above and beyond the T-Mobile network I have no regrets about switching.

I called Verizon with the same issue last Friday. Their resolution after a couple of questions was to overnight me a new (certified like-new) Charge and SIM card - the replacement was received on Monday. I haven't had any issues since, but I also stopped seeing the issue after I made the complaint.
Regardless, replacement has been better and locks a GPS signal much quicker. Maybe it's the SIM card?

SAME CRAP HERE!!!!
Sent from my SCH-I510 using XDA App

I tested if I have this behavior using LTE only mode (dial **583 in Phone app) and indeed I do, so this furthers my belief that my issue is not due to something wrong in the hand-off between 4G/3G.

I found out the way to actually change the data modes and tested using EV-DO Rev. A instead of eHRPD (in conjunction with LTE) and also using just CDMA 1X (in conjunction with LTE, essentially disabling 3G), but my issue of dropping data exists. The 4G LTE icon is displayed the entire time when it happens, I just seem to lose connectivity (and all three of the tests in the Phone Info area fail) temporarily. For what it's worth, I'm not moving the phone around at all when this happens.
I think I would actually be more content if when the data connection stalled, my 4G LTE icon just disappeared or if it switched to 3G because then it would make more sense to me (that I may have lost connection to the 4G service and it's attempting to reconnect to either 3G or 4G), but as it stands, all I get is a constant 4G icon with intermittent dropouts. The switch to 3G/1X seems to be the more common issue among 4G smartphone owners, but my (and the reviewer at Anandtech's) issue seems to deal completely within the 4G network, and I've tried every leaked radio to no avail.
The regularity of the dropouts seems kind of random as well; I'm not sure how I can figure out the source of the issue. Does anyone know if there are some logs that I can look into to see if something is happening to my phone at the very instant that I'm having these stalls?
Of course, I'm not discounting the fact that it might completely be on the side of Verizon's network and/or my area in San Diego and has nothing to do with my phone, and I may in a minority of users that actually continuously uses the 4G enough to notice these dropouts, which on average happen once every half hour to hour or so. Sometimes I'm able to stream something for several hours without the stalls, and other times it'll happen frequently within a short time span.

I just got off the phone with tech support for the intermittent data drop problem. After confirming that I was on EE4, and that I had tried doing a factory reset, he is fedexing me a new sim card.
Really hope it works, I love the phone but losing data for 1-2 minutes at a time randomly is pretty lame. Especially since I switched to Verizon for their reputation as the better network.

Racer447 said:
I just got off the phone with tech support for the intermittent data drop problem. After confirming that I was on EE4, and that I had tried doing a factory reset, he is fedexing me a new sim card.
Really hope it works, I love the phone but losing data for 1-2 minutes at a time randomly is pretty lame. Especially since I switched to Verizon for their reputation as the better network.
Click to expand...
Click to collapse
Is your problem the same as mine (data drops all while 4G icon is displayed) or is yours the more common 4G to 3G/1X transition or losing the 4G network icon data drop?

PeterDLai said:
Is your problem the same as mine (data drops all while 4G icon is displayed) or is yours the more common 4G to 3G/1X transition or losing the 4G network icon data drop?
Click to expand...
Click to collapse
The data will stop. Then the 4g or 3g icon will disappear entirely for a minute. Then it will reconnect at either 4g,3g or 1x, I don't really see a clear pattern, it seems totally random to me.

Is there anyone who's reading this that regularly uses their 4G continuously (i.e. hours) for streaming web content (e.g. radio streams, live video streams, etc.)? If so, do you experience any occasional dropouts or is the 4G connection for you rock solid?

Racer447 said:
The data will stop. Then the 4g or 3g icon will disappear entirely for a minute. Then it will reconnect at either 4g,3g or 1x, I don't really see a clear pattern, it seems totally random to me.
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Click to collapse
hey, I have exactly the same problem!

same here,lose 4g icon when i use either the mobile hotspot or the tethering option.longest i have been connected was about 15 minutes.

fender22 said:
same here,lose 4g icon when i use either the mobile hotspot or the tethering option.longest i have been connected was about 15 minutes.
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Click to collapse
Tested on mine and same result.
Edit: Rebooted and it works fine been on it 20+ now, I'll be testing some more

A couple of days ago my SIM card crapped out.
Now that i have a new one my 4G signal has been more consistent and stronger than ever. I live in a fringe area and before the new SIM it would constantly switch between 4 and 3G. Now i go for hours on 4G and it even stays on 4G in places that it would always switch and stay on 3G.
Get a new SIM before getting a new phone.
Sent from my Samsung Droid Charge: Stock EE4

After reading this thread I'm considering switching to either the Thunderbolt or the Revolution, or something else when it comes out...
Anyway, I have experienced this same thing.
The only difference in my situation is that I'm trying to use my LTE internet as a dedicated connection. The setup I'm trying to do is plug my phone into my router and have the router distribute the verizon LTE internet through my apartment. My router currently has the latest version of tomato installed and I compiled my own RNDIS module (modified to work with the charge). Everything works for the first few minutes (15-20), then I notice the 4G icon "stall", then disappear, then reconnect. After the first disconnect and reconnect, the internet connection is very unstable and will disconnect every couple of minutes until I disable and re-enable the internet again... very frustrating.
In the interim, I've been using EasyTether and this works very well. I have streamed hours of 720P video and it works flawless; not one skip or reconnect.
This leads me to believe that it is either one of the following:
The kernel - I'm currently using the PBJT kernel found in the latest version of humble. I'm not sure if the stock rom will provide better stability.
The radio - I currently have the EE4 radio installed, but am very curious to know the stability of the GB radio updates (EP1f, etc.).
Any other ideas would be greatly appreciated!
Thanks!

Network issue

Hi everyone
I have an issue, when I'm on my office the network signal isn't strong so when my One S go to "NO NETWORK" after it don't go back to network.
When the situation is this I can't go to airplane mode, change operator (from settings), the only thing that work is shut down and restart (no fastboot).
Anyone else have this problem?
Maybe is a software bug?
I have the Paul recovery and su
EDIT: More info
That don't happen every time that the phone go to "no network".
I think that happen when it a weak signals and are under 2G network.

there are users with similar issues, I only use 2G networks. If i want to do a bit of browsing i will manually change to auto mode, but other than that i always leave it at 2G..
hopefully there will be a radio upgrade soon that should fix this problem...

I'm suffering from the same behavior!
I'm still with the original ROM with no ROOT so I contacted HTC about it yesterday.
I got today their reply today:
"On your phone, kindly go to settings > mobile network > Network mode, kindly change the network mode and check how the signal will respond to each of them.
-Kindly try a different SIM card, to check whether the issue is with the SIM card or the phone itself.
- Soft reset for the device by pressing the power button for 10 seconds.( Note that soft reset erases any unsaved data.)
- Safe mode(which disables any 3rd party application which might be causing conflicts for your device.) for the device by Switching power on , then press and hold volume down when the quietly brilliant logo appears on your screen, you should see 'safe mode' text written on the bottom left of your home screen.
- Factory data reset, kindly backup your data before proceeding with this step please as you will
lose every data on the phone's memory.
Please go to Settings > storage > Factory data reset > Reset phone."
I haven't done anything yet and I didn't notice the 2G issue you mentioned.
I also haven't got this issue for the last 48 hours but did encountered it twice (!!!) on Sunday while driving across the country.
I'll try having the Network on 3G only and see if that matters although the area I leave in is not with good 3G reception.

GSM is 2G
WCDMA is 3G
i use GSM only unless im using the net

I'm aware to the 2G-3G difference
I'm on WCDMA preferred so my phone tries to be on 3G.
My phone also suffers from the 3G<->H data connection jumps while the desire wasn't having any with the same provider (different SIM of course).

sorry, My bad !!
i understand what your saying now
I cant confirm much as my provider doesnt have 3g signals in my area
If i try to use 3g at my home, I have 0 bars thats why i always use 2g

I switched to 3G only (since I have most of the time 3G and surly wants it for the data rate).
I know I have on my way to work and back places with 2G only but I'll give it a try for the coming days and reply.
BTW, just few minutes ago, while having 3G active for sure (before the 3G only switch when it was still on 3G preferred) I couldn't make any phone call although I had 4-5 bars and data connection was running.

Two days ago I tried to change my sim.
Before I had a cutted microsim, now an original microsim and the issue is still present.
Yesterday I had this problem only in afternoon, not in morning and only where the switch from no network -> 2G -> 3G is very very frequent.
In all other times out from office I never had this issue.

I also changed SIM with no help, stayed in 3G network only with no help and observed that when such a network crash happened, GPS reception is also disconnected!
I had no coverage situations with the 3G only mode which recovered, but what we are facing is a network "crash".
Our situation was escalated to technical support of HTC after I wrote them all the data and they tried to solve it over the emails w/o success.

Same problem for me. I tried only 2G, 2G/3G, only 3G, but no way..same problem..i hope an update can solve this..

I just bought my new One S from T-Mobile yesterday and everything appeared to be okay but now I can barely get it to hold a signal. Forget throwing it on GSM only because it will have signal for a whole few seconds before dropping it. I also am having Wi-Fi issues as well. It just intermittently drops the connection there as well... Not a great start!

whether im imagining this or not im not sure, But for me it seems like, When the Network signal increases, the WiFi signal drops, And when the WiFi signal Increases, the Network signal drops...
ive been noticing this for over a week now, So it cant just be coincidence..
I dont think my (or our) handset is faulty, I just think theres a pretty big bug in the ROM, and no matter if you switch ROMs they all use the same base at the moment..
This phone has great potential. But HTC need to be listening to us and release some updates. !!

azzledazzle said:
whether im imagining this or not im not sure, But for me it seems like, When the Network signal increases, the WiFi signal drops, And when the WiFi signal Increases, the Network signal drops...
ive been noticing this for over a week now, So it cant just be coincidence..
I dont think my (or our) handset is faulty, I just think theres a pretty big bug in the ROM, and no matter if you switch ROMs they all use the same base at the moment..
This phone has great potential. But HTC need to be listening to us and release some updates. !!
Click to expand...
Click to collapse
I noticed the same exact issue last night. My phone will go to full signal before dropping whichever connection. I'm just glad this phone can handle staying on 4G without draining the battery like crazy although I can only imagine how much further it'd go with 2G.
Sent from my HTC VLE_U using xda premium

worms said:
I have an issue, when I'm on my office the network signal isn't strong so when my One S go to "NO NETWORK" after it don't go back to network.
(...) the only thing that work is shut down and restart (no fastboot).
Click to expand...
Click to collapse
Exactly the same here. But I had a different WIFI issue - WIFI won't drop but stay connected - even if I am far away off the AP.

killerm said:
Exactly the same here. But I had a different WIFI issue - WIFI won't drop but stay connected - even if I am far away off the AP.
Click to expand...
Click to collapse
that one is also a known bug.
On top of that, WiFi will sometimes stuck at "error" status with no ability to turn it on...
All probably related to the same network chip driver or "Radio"...

I have same network reception problem. When I am in a poor reception area it loose reception all of a sudden and takes a while before getting the signal back. I often toggle flight mode to force network detection. I also think the reception bars don't reflect reality; sometimes it seems I have good 3G reception but cannot surf the web. I fear it is a critical bug. The phone seems unable to handle correctly signal fluctuations and protocol changes (GSM, 3G, HSDPA).

I'm colletting more data about this problem.
First of all I don't have any wifi issue, or maybe I don't see this.
I have a modem with N standard and one with G standard and nothing of this have issue.
About the network issue in this days I never have, only when I'm in office and the signal suck a lot.
Q: Anyone that have Tmobile/mod rom with 1.70 RUU have this issue?

worms said:
I'm colletting more data about this problem.
First of all I don't have any wifi issue, or maybe I don't see this.
I have a modem with N standard and one with G standard and nothing of this have issue.
About the network issue in this days I never have, only when I'm in office and the signal suck a lot.
Q: Anyone that have Tmobile/mod rom with 1.70 RUU have this issue?
Click to expand...
Click to collapse
I don't have wifi issue at work with a powerful 802.11n network AP but experienced occasional fake/unstable/disconnect wifi at home with a poor AP which operates on no-one-knows-but-definitely-not-N network. I don't really bother too much cos I can always turn wifi off and on to reconnect.
In terms of 3G/H signal switching problem, yes, a bit annoy especially when playing online game on 3G but accessing internet is fine just need to sometimes wait a bit longer.
I am on international unbranded version in UK.

I've the same problem in France about 3G/2G and wifi on international unbranded version.

Stock Nexus 5 on Wind Dropping network connection

Hello All!
I have a stock nexus 5 that constantly drops network. It happens downtown Vancouver and i noticed it as i moved here about a month ago.
I live 3 blocks away from a wind tower. Calling wind support did not help. I was told to do a reset and register wind as my home network. Also performed
a factory reset and they even issued me a new sim card and it still happens. I would be walking down the street and completely loosing all signal. Not a weak signal but a complete loss. I am absolutely puzzled. It happens once or twice a day and can last up to 15 minutes until i have a signal again. I noticed that wind no longer carries nexus 5. Should i be worried. After speaking to some people they think it could be a combination of Android 4.4.4 and poor wind signal that is causing this and that there probably wont be any difference until new Android version. Has anyone here experienced anything similar? Any help would be much appreciated. Thanks!

I would borrow a SIM card from someone on a different network and see if it's able to hold a connection. If so, then there's an issue with Wind's network and your phone. Otherwise if the issue persists on a different network then it's a hardware issue.
It's a long shot but are you using a case on the phone? For what it's worth my stock N5 on Wind in T.O has no issues.

vseslija said:
Hello All!
I have a stock nexus 5 that constantly drops network. It happens downtown Vancouver and i noticed it as i moved here about a month ago.
I live 3 blocks away from a wind tower. Calling wind support did not help. I was told to do a reset and register wind as my home network. Also performed
a factory reset and they even issued me a new sim card and it still happens. I would be walking down the street and completely loosing all signal. Not a weak signal but a complete loss. I am absolutely puzzled. It happens once or twice a day and can last up to 15 minutes until i have a signal again. I noticed that wind no longer carries nexus 5. Should i be worried. After speaking to some people they think it could be a combination of Android 4.4.4 and poor wind signal that is causing this and that there probably wont be any difference until new Android version. Has anyone here experienced anything similar? Any help would be much appreciated. Thanks!
Click to expand...
Click to collapse
I would try this app and see if it is just when your downtown or if it happening every where, could be the network or it could be the phone, this will track signal strength and everything should give you a good idea of at least what your phone sees going on.

[SOLVED] [Q] Weak signal / Drops to roaming

Hey Guys,
i am on drei.at (3-AT) and since i upgraded from CM11 to the lollipop factory image (currently without root) my signal is much weaker than before. My new baseband version is M8974A-2.0.50.2.21, reverting back does not make a difference. I had the same problem with my Nexus 4 which i dumped for the Nexus 5.
The months before i updated the phone everything worked normal and as it should but now if i move the phone from one room to another or even take a walk outside it will loose the connection to the carrier and changes to roaming. The real problem is that it get stuck in roaming and cant get back to 3-AT, the only way to fix it is to restart the phone or search manually for the net.
After that it works till it drops the connection and the whole process starts from the beginning.
I can only compare the signal strength with the normal signal strength icon.
Work before 2-4 bars (maximum one connection drop per day)
Work after 1-2 bars (connection drop around every 10 minutes or if i change the room)
Home before: 3-5 bars (no connection drop)
Home after: 1-3 bars (many connection drops depending on position)
I hope you can give me some ideas to fix this. Thank you for your input!
Greetings

Bergmensch said:
Hey Guys,
i am on drei.at (3-AT) and since i upgraded from CM11 to the lollipop factory image (currently without root) my signal is much weaker than before. My new baseband version is M8974A-2.0.50.2.21, reverting back does not make a difference. I had the same problem with my Nexus 4 which i dumped for the Nexus 5.
The months before i updated the phone everything worked normal and as it should but now if i move the phone from one room to another or even take a walk outside it will loose the connection to the carrier and changes to roaming. The real problem is that it get stuck in roaming and cant get back to 3-AT, the only way to fix it is to restart the phone or search manually for the net.
After that it works till it drops the connection and the whole process starts from the beginning.
I can only compare the signal strength with the normal signal strength icon.
Work before 2-4 bars (maximum one connection drop per day)
Work after 1-2 bars (connection drop around every 10 minutes or if i change the room)
Home before: 3-5 bars (no connection drop)
Home after: 1-3 bars (many connection drops depending on position)
I hope you can give me some ideas to fix this. Thank you for your input!
Greetings
Click to expand...
Click to collapse
Flash the old baseband. http://forum.xda-developers.com/goo...t/modem-nexus-5-flashable-modems-efs-t2514095

As written i tried a bunch of older Modems but had no luck. I tried one of the later modems and now i'm two days on M8974A-2.0.50.1.17. For now eveything works normal again!
Thank You!

I was having problems with the modem that comes with the Nexus 5 factory Android 5 image and flashed to baseband m8974a-2.0.50.1.16 (Android 4.4.4 radio). That improved my signal strength some but I'm still getting signal drops, just less frequent when the phone is just sitting on its charger in a fixed location. I'm in the USA on AT&T's network. Do you suggest I try the baseband radio M8974A-2.0.50.1.17, even though that is only included with a version of Android listed for certain countries?

I had similar problem although im in Europe and problem was in APN settings....after days or tying to set my APN it worked finally and i was able to catch LTE that disappeared after upgrade to 5.0 along with poor signal and dropouts off the network completely.
cause my carrier support was bad even they provided me half correct information..
about flashing another baseband they are total noobs and dont even know what the baseband is...
Any way connection is still poor but at least constant even with LTE with 5.0 baseband.
Sent from my Nexus 5