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wifi problems laggy, crashing

hi all.
As I mentioned in my other post I have been having some serious wifi problems. Basically if I leave the wifi off the phone seems to work fine. When I turn it on however, the phone becomes laggy and it does not work. After turning the wifi on from the settings page, it says it is scanning for networks. After 20-30 seconds a little bubble pops up and says "unable to scan for networks" it will continue to try and scan on and off but never is successful. The phone is better to start up with the wifi off because if on, the phone becomes almost unresponsive and I am assuming it is because it is trying to scan in the background.
I just rebooted into the recovery menu and wiped the cache and device, but no luck. Any other ideas as to why this is happening?

Little update:
I found a few other threads where people complained about the same problem. Their recommended fix involved removing the file "/data/wifi/bcm_supp.conf"
The full thread is here: http://androidforums.com/samsung-moment/46179-unable-scan-networks.html
I tried that and also did a factory reset but unfortunately have not been able to fix the problem. Does anyone else have any other ideas?

hi Scales11
I'm also having the same problem..
did the
1. factory reset
2. new ROMs - Darky 7.01, Cognition 2.3...
3. delete the /data/wifi/bcm_supp.conf file
and still no luck... and realised bluetooth isn't working either..
anyone?? please help?

If you have flashed other ROMs and still the same issue. I would say its a hardware issue.

my fix
Geekboy9:
I meddled it for hours and while others have found various odd reset/rom fixes, I concluded that it was a hardware issue which cannot be fixed.
I flashed it back to a stock rom and went to att. They agreed that it didnt have any water damage and gave me a number to call about getting a replacement. Since the phone was less than a year old and its failure was not due to my use, the replaced it with a refurb. All in all the refurb seems fine, even after I rooted and flashed the cognition rom. I would recommend you do the same.

[Q] Note pro 12.2 keeps rebooting after using facebook app

i just got my note pro 12.2 wifi version (international) a few days ago and already experiencing problems, firstly the wifi was so slow so i updated it OTA to the latest stock firmware i can't remember what it is but it's the latest official 4.4.2 they have and that improved the wifi but now i'm encountering issues of rebooting randomly after using facebook app. it's always after i lock the screen it suddenly reboots after 2 mins or something especially if i have say been using a lot of memory for it.. ie if i scroll down 4000 friends that's when it always reboots once i lock the screen. is this liekly to be hardware or software issue or an app issue?
i have only had it a few days so haven't managed to play with it enough to test it to the max.
just now it rebooted and i played one youtube HD video and used multi window to use the facebook app (old version 7.0 - i like this version).. but i hadn't used the facebook app that much while on, the only thing i did different was i plugged in my samsung s3 charger into the note pro to test how long it would take to charge using a usb 2.0 connection instead. it's official charger official cable, is that likely to cause reboot issues?
previously it was just after using facebook for a long time for a ram intensive amount, i also tested it after reboot and using facebook a bit and locking screen and it didn't reboot so it made me think ok it's just when facebook is being used a lot and all the ram and memory is exhausted caching 4000 friends viewing so i didn't think anything of it.
is this likely to be hardware or software issue? are hardware issues ever the main problem with rebooting?
I know the usual tests, having to use odin to flash official firmware, trying a different facebook version, removing and not using facebook at all and see if it still reboots and lastly factory reset.
ideally i'd like to avoid all of those things as it is a major hassle and i can live with the reboot issue provided it isn't a hardware problem. is there anyway to test it to know for certain it is hardware and not software and the app?
edit: it keeps rebooting even if i dont use the app
seems to happen when i lock the screen sometimes it just reboots randomly.
anyone else have this?

You could try to remove that facebook app and see if that fixes the problem.

does anyone know what is causing this?? is it hardware?
i've factory reset removed all apps, then added one app at a time then added about 6gb of videos and added wakelock detector. all seemed fine
then i tried to unmount the sd card and then it rebooted.. why is it doing this??

pete101 said:
does anyone know what is causing this?? is it hardware?
i've factory reset removed all apps, then added one app at a time then added about 6gb of videos and added wakelock detector. all seemed fine
then i tried to unmount the sd card and then it rebooted.. why is it doing this??
Click to expand...
Click to collapse
Could it be a bad sector on the SD card? I'd long format it using a pc to be sure.
Sent from my SM-P900 using Tapatalk

it's not the faceboook k app i've realised now it just coincidentally seemed to be that as it is ram intensive.
i factory reseted and then put the app back on but didn't log in. 3 times it has rebooted by itself over different scenarios.. 1 plugging in a samsung usb 2.0 charger from a samsung s3, 2 when unmounting sd card, 3 when closing the screen when any ram intensive app is in the background (there's still like 500mb of ram left!! i dont know why it's rebooting like this.
i can't figure it out. is anyone else having these issues? im not sure if it's a kitkat 4.4.2 issue.. reading forums from other users with different devices i'm seeing the reboot issue coming up alot especially on the s4.
http://forum.xda-developers.com/xposed/modules/samsung-kitkat-systemserver-crash-fix-t2806046/page22
but i dont know for certain if it's a hardware issue.
my next steps which i really want to avoid is to factory reset AGAIN and not load any apps (the problem with this is it requires a certain amount of ram intensity to be used before it randomly happens.. if i dont add any apps like instagram or facebook or tumblr i can't get it back to the state where it reboots randomly)
i've also enabled all apps (i usually disable all the bloatware i can without being rooted) but it does bring up errors of android.core.process has stopped etc and some gapps errors (im hoping this is the cause of the reboot) and see if it reboots. it's difficult recreating the scenario consistently.
i udnerstand it might reboot if you've overused the memory but it clearly shows lots is free so i can't figure out what is causing it?
my next step after all this is to flash the latest version of stock so i can't put it down to the OTA updates that is causing it. if that fails i revert to odin to flash the original 4.4.2 it came with.. and failing that i'll have to return it
does anyone have any ideas whether it is hardware (maybe the power button is slightly off so when you press down it in a certain angle it triggers a restart?)
or is the motherboard or corrupted sector of the memory which when it writes over it causes the reboot?
i always assumed reboot issues were normally always firmware issues and not hardware.. surely samsungs quality control is a bit better than that??

If it were me I would yank the microsd card out, factory reset, set up just my gmail without allowing auto backup/restore and apply all updates. I'd then let the tablet run for a full day and use it just for web browsing and Youtube to see if the problem is still there. I would not install anything for at least a day, including the microsd card. This would be as stock as one could get and rule out the possibility of it being any software that I installed or the microsd that I was using.
I suspect it's software but the only way to know is to be patient and test it out for sure.
Sent from my SM-P900 using Tapatalk

Hi,
same tablet, bought there is 3 weeks. I installed the latest firmware update (XXUANI1)
I rooted the tablet (to allow sd-card writing).
and that's it.
like some of you, I have random reboot.
I can't remember if it happened before the root or not. I think that yes, but I am not 100% sure.
I don't see anyone reported that the root cause random reboot...
it is really random. sometime, the tablet stay one night without reboot, sometime, I can have 3 reboot in one hour.
I don't find what kind of application is causing that issue.
I really believe that it is software. before the firmware update, I stayed 2 weeks without any issue.
I tried to reboot in recovery mode, and wipe the cache, without success.
I will probably try to do a factory reset...
Olivier

orobin said:
Hi,
same tablet, bought there is 3 weeks. I installed the latest firmware update (XXUANI1)
I rooted the tablet (to allow sd-card writing).
and that's it.
like some of you, I have random reboot.
I can't remember if it happened before the root or not. I think that yes, but I am not 100% sure.
I don't see anyone reported that the root cause random reboot...
it is really random. sometime, the tablet stay one night without reboot, sometime, I can have 3 reboot in one hour.
I don't find what kind of application is causing that issue.
I really believe that it is software. before the firmware update, I stayed 2 weeks without any issue.
I tried to reboot in recovery mode, and wipe the cache, without success.
I will probably try to do a factory reset...
Olivier
Click to expand...
Click to collapse
Assuming you have custom recovery installed as well; have you tried wiping dalvic? It will force applications to recompile and possibly fix a corrupted application or its associated files.

Hi,
I just checke.…
I was thinking that the root method was not setting the knox flag, so i was thinking there is no recovery in the file flashed… .
I was wrong.
My waranty is void, knox is set. I still have no custom recovery : in the file provided by chainfire, there is a recovery which is probably coming from samsunG…
So i will install a new recovery and try to wipe all caches dalvik.etc.

Hi,
since my knox is set now :
I tried to install TWRP recovery, which allow me to do a wipe of the cache AND dalvik Cache.
it did not resolved anything. the tablet still reboots randomly.
then, I decided to restart from scratch :
I flashed the same firmware I had, using ODIN, and do not root it.
this is this firmware : http://www.sammobile.com/firmwares/database/SM-P900/XEF/
I will keep you updated if it solve the reboot issue or not.
thanks
Olivier

pete101 said:
i always assumed reboot issues were normally always firmware issues and not hardware.. surely samsungs quality control is a bit better than that??
Click to expand...
Click to collapse
Hi
I had the same problem and also thought it was the power button that was faulty but then I flashed the previous firmware then tried to use it a bit and no reboots since so I guess samsung released a new firmware that solved the slow wifi problem but then boosted it a little too much or so it seems judging by the reboots whenever there's too much overload.
So I guess for now I will stick with an older firmware

oops... it rebooted while I was surfing the play store so I guess I spoke too soon

[Q] No SIM card - Emergency calls only

Hi, everyone, sorry to bother you, but I'm in a bit of a pinch.
My unrooted stock Nexus 5 was running smoothly with then latest OTA update 5.0.1 until I got No SIM card error. I eliminated SIM card as problem source, removed SIM, discharged it completely and after few days turned it on and it was working. But problem returned soon and same method didn't show result. So things I already did:
- check my card in other phone: works
- check other cards in my phone: doesn't work either
- left it off without SIM for a few days
- erase cache
- upgrade to OTA 5.1.0
- factory reset
- unplug battery from motherboard for some time
- flash stock 4.4.4 from developers google com
- put some tape on card to make contact better
in this order. My next move would be to check if SIM card case pins are broken. Warranty expired month ago so there's that. Do you have any advice to give me? Is there any part of the phone that could've stayed not wiped during 4.4.4 stock flash and that's the reason problem remained?

You have a weather widget, clock, GPS location app that is causing the issue. Try uninstalling one at a time until you find the culprit. For me it was transparent weather clock widget that was causing this. Something about the way the app polls the GPS location causes problems.

I flashed stock 4.4.4 and only stock apps are present. I can either uninstall upgrades or root and delete gapps for good. What say you? I think phone somehow got "stupid" hard and I have to reset certain part that wasn't affected during flashing because it haven't once worked throughout process.

My nexus 5 is doing the exact same thing, exactly as you described, since the update. I'm losing my mind
Seeing as we both have the issue I don't think its a problem with your phone in specific. If anyone knows please help! I've tried uninstalling every app, going on safe mode, swapping sims etc

ag1000 said:
My nexus 5 is doing the exact same thing, exactly as you described, since the update. I'm losing my mind
Seeing as we both have the issue I don't think its a problem with your phone in specific. If anyone knows please help! I've tried uninstalling every app, going on safe mode, swapping sims etc
Click to expand...
Click to collapse
If it happened immediately or just after update try flashing stock KitKat.

Got the same trouble
The problems begun 1 week ago with interruptions with the radio, i have to restart the phone with Stockrom 5.1 self flashed and uber-kernel to get any connection. Switch the airplane mode often to get any radio signals. I ask my provider o2-germany for some trouble in their radio stations - and there was, just a few hours it worked. In a few days ago I traveled across germany, from the south to the north and back, got while traveling no good receptions, only gprs and edge. And now I switched from stock-rom 5.1 to OptiPop 5.1 the trouble begins with no-simcard ...
I will try xTraSmooth 5, when this ist not working i try an older image...
Edit:
OptiPop working now without flashing UBER Kernel. Now Issues so far!

Mine is absolutely stock on 5.1, not seen it once in 18 months and now it has done it twice in 12 hours.

I've always been completely stock and my phone started doing this every time I reboot it. Any more word on this? It also does seem my GPS looses lock on a lot too. This seems to have started since the last OTA update a few weeks back or so.

after i flash latest factory image mmb29v I got No SIM card error. There is an error in Safe Mode and SIM card not detected .pleas help me

[Q] Keeps rebooting when USB is unplugged.

This is a very strange issue, I'll describe it here. I bought recently a OnePlus One in Spain. I've followed these steps:
1. Install CWM from High on Android guide
2. Install Android 5.1.1 from Gizbot guide (which comes from this XDA guide).
I finished the steps and got Android working perfectly. I love how smooth it is and all. However, I was ready to leave so I unplugged the USB (official cable). The phone freezes for few seconds and then it reboots. Now, I have tried many things and been in the same point many times, so there are two behaviours that can occur:
- When starting from the beginning with the cable unplugged, the Dirty Unicorn spinning wheel just freezes and reboot. It keeps doing so constantly. Reboot hell.
- When starting with the USB connected, but after a reset from disconnecting it, it goes into "Android is starting... Optimizing app 8 of X". There are two odd things here: the X is a different number each time it reboots, like 55 or 90, and then it freezes apparently at Google Apps and reboots again. Same reboot hell, but longer.
Now, I can turn it off, enter into recovery mode and reinstall everything. This is what allowed me to test exactly when it breaks. In any case it will only even start the Android 5.1.1 if the USB is connected.
My question is, any idea why this is happening? Any recommended step once inside Android to try to avoid this?Otherwise I'll try with another ROM, but I think that it's super odd and it looks like it might be fixed easily by someone who understands the system better than me...
Few extra details:
- Battery is 100%, so no apparent problem there.
- I'm using Ubuntu 15.04 on the computer side.
- I don't have a SIM card yet.
PS, if trying other ROM/gapps, which one do you recommend?

fpresencia said:
This is a very strange issue, I'll describe it here. I bought recently a OnePlus One in Spain. I've followed these steps:
1. Install CWM from High on Android guide
2. Install Android 5.1.1 from Gizbot guide (which comes from this XDA guide).
I finished the steps and got Android working perfectly. I love how smooth it is and all. However, I was ready to leave so I unplugged the USB (official cable). The phone freezes for few seconds and then it reboots. Now, I have tried many things and been in the same point many times, so there are two behaviours that can occur:
- When starting from the beginning with the cable unplugged, the Dirty Unicorn spinning wheel just freezes and reboot. It keeps doing so constantly. Reboot hell.
- When starting with the USB connected, but after a reset from disconnecting it, it goes into "Android is starting... Optimizing app 8 of X". There are two odd things here: the X is a different number each time it reboots, like 55 or 90, and then it freezes apparently at Google Apps and reboots again. Same reboot hell, but longer.
Now, I can turn it off, enter into recovery mode and reinstall everything. This is what allowed me to test exactly when it breaks. In any case it will only even start the Android 5.1.1 if the USB is connected.
My question is, any idea why this is happening? Any recommended step once inside Android to try to avoid this?Otherwise I'll try with another ROM, but I think that it's super odd and it looks like it might be fixed easily by someone who understands the system better than me...
Few extra details:
- Battery is 100%, so no apparent problem there.
- I'm using Ubuntu 15.04 on the computer side.
- I don't have a SIM card yet.
PS, if trying other ROM/gapps, which one do you recommend?
Click to expand...
Click to collapse
Same issue here, did you ever figure it out?

Had the same issue today but with another rom. Fixed it by first installing CM12 latest release and booting, then flashing custom rom + Gapps + Kernel.
Maybe this helps for you as well!

Hi guys
any solution to this issue?? It happens to me as well, now with latest Oxygen ROM (from yesterday).
When it is unplugged it will reboot. not if plugged in.
Help!!

Can you give us specific details as to what ROM, Kernel, and Gapps versions you used? This problem is a seemingly unfixable one at the moment.

Phone (G3) crashing and rebooting except on usb

Hi,
so for some time now the phone has been crashing randomly (although mostly when sending/receiving messages, calling, using a browser or listening to music) and then rebooting every few days. After the reboot it was alright for a bit
after a while it crashed multiple times in a few minutes, and then today it just kept crashing and rebooting, going as far as not even making it past the booting screen. just crashed and tried rebooting again.
did a factory reset, don't think it helped, but it seems that as long as it's on the usb cable with the pc it boots just fine, and does not crash.
Any ideas?
Edit: nvm just crashed on cable... but it seems a lot more stable and boots every time at least
also no sd card is installed
Update: crashes pretty much every time I want to install or update an app, and then gets into an infinite boot process of crashing and rebooting
While a usb cable (just in the phone, not connected to anything else) doesn't effect it, a powerbank seems more then enough for it to boot consistently so I think the battery might be giving up.
Thoughts?

For anyone in the same boat as me (and because I don't like stumbling over unfinished threads when looking into a problem myself):
Since I got no response I went ahead and got a new battery for 12€, had that now for a week and tried everything to get the damn thing to crash. It looks like the issue has been resolved as no crashes occured whatsoever, so if anyone of you guys has a crashing problem that seems to get worse over time and better when plugged in, you might have a faulty battery on your hands.
Which incidentally is one of, if not the cheapest problems you can have (as long as you have a phone with a removable battery ofc)
Also, is it possible to mark a thread as resolved?