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Intermittent Data/Cell -Exclamation Mark in Signal Indicator

This happens on every Lollipop ROM I have flashed, no problems on 4.4 ROMS. I do clean installs, do not restore anything from Tibackup. So basically what happens is I will randomly but very frequently lose all data and cell service. Like once every three minutes frequently. It only lasts about 5 seconds at a time. The signal bar triangle will have an exclamation mark in it (see attached example). I delete and re-enter my APN, turn off wifi AND the Scanning Always Available option. I have read some threads about this exact same thing happening on Nexus 5 after Lollipop update but they are old and it seems to have been fixed with an update. Does anyone have any ideas about what is going on? I'm on TMO in the US and like I said, it ONLY happens on Lollipop ROMs it does not happen of Kitkat.
I read this as sort of an explanation as to why but nothing as to how to fix it. It is driving me insane.

I'm in the same boat, I cant make calls with hangouts or with Dialer or it will disconnect. I haven't seen a solution yet. I've tried every ROM I can, but it keeps crashing. drives me up a wall. I want to logcat it, but having issues while at work.

budm said:
I'm in the same boat, I cant make calls with hangouts or with Dialer or it will disconnect. I haven't seen a solution yet. I've tried every ROM I can, but it keeps crashing. drives me up a wall. I want to logcat it, but having issues while at work.
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Click to collapse
Only discussion about this I have seen is in the Nexus 5 forums, nothing in OPO

Any insight to this would be greatly appreciated.

Come on guys, am I really the only one with this issue?

TigerDNA said:
Come on guys, am I really the only one with this issue?
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You're not alone, I have this as well but I don't get the exclamation mark but instead the triangle appears completely empty, as if I have no signal at all.

anyone know a way to fix this awell? i flashed the new lolipop alpha modem and still same thing if not worse

The only time this has happened to me is when I toggle Wi-Fi. It for this every time, but have no data issues otherwise. Seems to be when switching between ip addresses. Are you possibly between towers or roaming on another network? May be the issue, but I can't say for sure. Running the lollipop rom exodus, no issues at all.
EDIT: also what baseband are you guys on? I thought I saw something similar and someone flashed a test baseband and it fixed whatever issue they were having. Link coming shortly.
EDIT 2: just now noticed the list above mine about the alpha modem and it not working for them. If anyone else needs to try however, link is http://forum.xda-developers.com/sho... work for some and not others.
from the one+

Does anyone know if we can flash the CM11S modem on CM12?

Go to Settings -> More - > Mobile Networks. Make sure all the items are set correctly.

alleykat2561 said:
Go to Settings -> More - > Mobile Networks. Make sure all the items are set correctly.
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In OP "I delete and re-enter my APN, turn off wifi AND the Scanning Always Available option."

Same issue here. Running SlimSaber using alpha radio.

Same problem on two OPOs here, both running Temasek CM12

Anyone found a solution yet?
I have the same issue on CM12, BlissPop and Validus ROMS.
Strangely I do NOT have the issue on Euphoria.
Think it happened after I flashed the Alpha L modem.
Tried flashing an older CM11S modem, but no luck...

Hi,
Sorry for the noob answer but anybody tried settings>mobile networks>preferred network type and set it to 3G? I flashed a new rom from stock CM and noticed that I was experiencing signal trouble, I checked my status and the signal detected is LTE so I changed my network to 3G and network signal improved. Downside is that you cant use LTE (but thats ok for me since here in our country, LTE signal is still kind of limited)

Zino same for me. Ever find a fix or a rom that doesn't do this?

OP here, it's strange that all of us have this issue, the same issue that came up on the Nexus 5 thread when L was first released but know one else seems to have any knowledge of it. I am almost certain it doesn't have to do with our carriers but rather something software related.

I'm also suffering from this issue, until now the only way I knew how to fix it was to wipe the cache in recovery which takes ages!

got the same problem :<

I have a similar issue. I use t mobile in the USA and LTE works, H+ works, but 3g shows signal and won't load anything. No idea how to fix it.

[Completed] no service and no network issue

i have been facing this problem from the last 5 days. i have no network in my samsung sgh t959 phone usually i used t get this problem bt then it the network used to come back automatically
bt now since 5 days there has been no network in my phone i tried every single thing i did a factory reset, tried changing sims, when to mobile network ad searched for network,did a ping test run selected every single mode (cdms gsm lte etc) even did turn off radio . i even i checked with the imei my phone is displaying the imei properly .i guess there is no corruption in my imei
so please can anyone help me with this issue. i am still looking fo a perfect solution for this issue.

XDA Visitor said:
i have been facing this problem from the last 5 days. i have no network in my samsung sgh t959 phone usually i used t get this problem bt then it the network used to come back automatically
bt now since 5 days there has been no network in my phone i tried every single thing i did a factory reset, tried changing sims, when to mobile network ad searched for network,did a ping test run selected every single mode (cdms gsm lte etc) even did turn off radio . i even i checked with the imei my phone is displaying the imei properly .i guess there is no corruption in my imei
so please can anyone help me with this issue. i am still looking fo a perfect solution for this issue.
Click to expand...
Click to collapse
Hello there! Welcome to XDA!
First register an XDA account (so you can ask in the proper forum)
then, you may ask for help here: (see below)
Samsung Vibrant Q&A, Help & Troubleshooting
Your device experts are located there....(You will have a much better chance of getting help there)
Also, here is the Main Samsung Vibrant Area just in case:
http://forum.xda-developers.com/samsung-vibrant
Always Remember to use the Search...
Thank you! Hope this help!

A110: Mobile Signal / Network issue.

Hello Tech,
Back ground Story: I purchased Micromax a110 on resale.
Issue: Mobile signal / network is not consistant. Some time, it shows it is in Roaming. And, sometime, it shows No Network.
Android Version: 4.1.1
Trouble shooting I made:
- As I purchased it on resale, there is no warranty.
- Installed app to Root the phone.
- Format the phone, but, then also, issue is persist.
- Check same Sim on another smart phone, came to know, its working fine.
Note: I read so many posts on sites, but, unfortunately, I did not get luck to fix this issue.
Could any one please assist me on this?
Thanks & Regards,
VK Shah

G900P 6.0.1 OTA Update Problem!

Hi Everyone
i have an S5 (G900P) and yesterday i had an update to Android MM 6.0.1
Everything works great but the only problem is before the update i had a GSM signal, and After it, it lost the connection and i can`t make or receive calls
Does anyone knows how can i fix it?

I have the same problem....would love for some help too

Are you saying that you're not able to use GSM while traveling internationally? Have you done the basic stuff, like going to Settings=>More Networks=>Mobile Networks and switching the network mode to GSM? Then make sure the roaming settings are correct? Also, it's always a good idea to update the phone's profile (Settings=>System Update) after a firmware update.
Hopefully one of these suggestions fix the issue...

view9234 said:
Are you saying that you're not able to use GSM while traveling internationally? Have you done the basic stuff, like going to Settings=>More Networks=>Mobile Networks and switching the network mode to GSM? Then make sure the roaming settings are correct? Also, it's always a good idea to update the phone's profile (Settings=>System Update) after a firmware update.
Hopefully one of these suggestions fix the issue...
Click to expand...
Click to collapse
6.0 is a major update , personally i always recomend doing a factory reset after the update to start fresh and avoid problems.

I have a different problem when i go to settings and try to use toolbox or edit my notification panel which no longer displays i get error settings stopped working.
This has happened a dozen times since update a week ago
Sent from my SM-G900P using Tapatalk

Alejandro122125 said:
Hi Everyone
i have an S5 (G900P) and yesterday i had an update to Android MM 6.0.1
Everything works great but the only problem is before the update i had a GSM signal, and After it, it lost the connection and i can`t make or receive calls
Does anyone knows how can i fix it?
Click to expand...
Click to collapse
You can fix it buy going to the dial pad and pressing
*#*#4636#*#*
And going to phone information and edit the signal from there
Sent from my SM-G900P using XDA-Developers mobile app

WiFi stopped working - H950 (5.1.1 PR VARIANT)

Hello everyone.
I'm having trouble with my h950 (installed the PR 5.1.1 rom long time ago) device.
A week ago WiFi stopped working. This is:
When I choose a network I want to connect to, it starts connecting but instantly the wifi turns off and then it turns on and it turns off and so on...
I already tried doing a hard reset and also installing the KDZ for the 5.1.1 PR version again but it remains the same.
Has anyone gone through this issue or anyone who can give me any advice?
Thanks

more info?
Hi there,
what is the *exact* behaviour your WiFi exhibits? Does it keep flashing like in this video?
https://www.youtube.com/watch?v=4W8YJMDFM88
If so, you might be experiencing a hardware issue. I've written a detailed summary about this, you may want to check it out here: http://forum.xda-developers.com/general/help/qa-wifi-stuck-mac-020000000000-g2-g3-g4-t3452133
Good luck, and keep us posted if you find a solution for your problem!

NimbleWeasel, thanks for your reply.
I got a friend to upload a video. on youtube Not the best quality. Ignore the sounds
I can't post a video since I'm a new user. The youtube id for the video is R1pKIzJ5mwg
I think it IS the same problem.
If it actually is a hardware issue, I guess I'll just have to get a new phone.

WiFi trouble...
hi disreggae,
i watched your video but it seems to be a different problem.
i'll write you a private message with something that you can try if you want.

my wifi is not working
It says its on but nothing is showing up and I can't connect to anything and my wifi will not turn off and I tried to reset everything and still is not working