Database Users

Constant Phone/Touchwiz reboots - help if you can

Hello everyone, I've got an interesting problem that I want the experts here at XDA to help me troubleshoot. Feel free to ask questions as I know there's probably a million variables at this point with stuff installed, uninstalled, gps, root, task killers, etc.
alrighty with that said, I did the e-wrecked gps fix (changing the operation mode and server location+port). That seems to work great in terms of time to lock on my position as well as improved accuracy. Over the next couple of days I noticed some really choppy and lengthy phone start ups after the fix.
Eventually it got to (and currently is at) a point where it kept rebooting the phone, or at least touchwiz. It would load up, scan media, search for the network, do all the start up stuff, then lock up, and turn the screen off. Hitting the lock button/power button does nothing while it resets itself. Then it resets to the lock screen, the screen lights up and it goes into "searching" for the tmo network while doing the storage preparations, and other boot up stuff. It does not restart from cold (with the vibrant, tmo, and galaxy animations, only the lock screen and OS boot process)
Anyone else got any funky restarts going on, for whatever reason? I basically want to start seeing what would trigger this behavior. I started uninstalling stuff one by one trying to figure out why its doing that but sometimes it boots up fine, sometimes it boots but doesn't ever find tmo's network, and sometimes it just does the above.
Observations:
1. It will always boot up fine if the SIM card is out.
2. The last time it did it was today while I was at work, listening to music while the phone was charging. Im noticing that the phone gets pretty hot while charging and really hot if you're using while its charging (getting apps, surfing the web, playing games, etc)
So any thoughts from the tech gurus here? anyone have similar behavior in the past on other phones? is the heat affecting the sim card negatively? I can (and have) put my simcard back in my treo 680 backup phone with no issues whatsoever.

New observation, it consistently does the reset process as soon as the "Adjust Time and Date" as it registers/syncs with the network.
UPDATE: so, i did some research, ended up at the setCPU thread and saw that when set to OnDemand some people's phones experienced similar tendencies. Problem is, mine was already set to auto-detect and "Conservative". I un-checked start at boot, and tried again. Same problem. I uninstalled setCPU completely and my phone appears to be back to normal.
I'll update again if anything changes.

so one of the things that i removed during my troubleshooting was my corporate exchange account. When i added it back. it did its initial sync fine and gave me my calendar and contacts. I then rebooted and the problem came back.
I removed the account and rebooted. it went through two cycles of the restarts and on the third one, it worked. I left it alone after that.
I then was showing my friend some things (browser differences) and had 3 browsers open. It froze as i went to close Dolphin HD. Rebooted and now its back to the cycle.

Mine did this also. Installed several apps, woke up to find a slow phone. Resets galore. A quick reset to defaults and app restore fixed it, sans setcpu of course.
From XDA App on SGS-Vibrant

my phone resets itself also as described above, but not really doing anything in particular. i dont have a whole lot of apps installed. i even was using google maps the other day and after it started up the screen went black and the device was unresponsive until the screen came back and it said searching and the media scanner was running.

well first off thanks for responding lol. i thought i was by myself out here.
secondly, i found that if i leave it alone and let it go through its cycle, it does eventually boot up ok (this is recently, before, it was endless). i havent restarted my phone (im afraid to lol) since it did it on its own yesterday (showing my friend the browsers).
since yesterday, i've used it for navigation (motonav), serveral installs, downloaded podcasts, rss feeds, etc and its been ok (even while charging and wifi on). again, havent actually restarted it since yesterday because its actually functioning for once.
Lastly, i unchecked the auto update time and date from network in the settings just to see if that makes a difference because based on previous expereience that is the point where it freezes and resets. Thanks for chiming in and let me know if there's any other advice you have

I'd suggest a reset as mentioned above.

Been checking out this site for awhile but this is my first time posting, today my phone started to have this problem and it just bootloops touchwiz if i have a simcard in the phone.
It works fine without a simcard but my problem is it will not let me turn of auto update of time and date, i have tried disabling this setting and it just enables itself again. I have also noticed that if I started messing around with time and date settings even without a sim touchwiz reloads once. I guess im gonna give a reset a go.

martin0641 said:
Mine did this also. Installed several apps, woke up to find a slow phone. Resets galore. A quick reset to defaults and app restore fixed it, sans setcpu of course.
From XDA App on SGS-Vibrant
Click to expand...
Click to collapse
heygrl said:
I'd suggest a reset as mentioned above.
Click to expand...
Click to collapse
sorry, noob question (i came from winmo and a touch pro 2), what does "a quick reset to defaults" mean? is that like a factory wipe i.e. phone will be brand new again, gotta root again and reinstall everything, change settings, etc?

jblade1000 said:
sorry, noob question (i came from winmo and a touch pro 2), what does "a quick reset to defaults" mean? is that like a factory wipe i.e. phone will be brand new again, gotta root again and reinstall everything, change settings, etc?
Click to expand...
Click to collapse
Root will stick but settings and apps/app data will be gone. It briefs you on what is and isn't lost when you do a factory reset.

Smae problem, its setcpu!
SetCPU with any settings will do this.
It needs an update, the auto detect some how loses and
will set the cpu to 19mhz max and min.
This is too slow to process. I rebooted and pressed settings and uninstalled it
while I could. Seems to behave once out of touchwiz.

For me it was another app not setcpu I never used it. After i did a reset i restored all my apps with titanium backup and once i restarted my phone it looped again. So i did another restore and left off all the apps that i installed right before the problem started and so far i think for me at least one of these caused it
Google maps update
google translate
the extra language pack for translate
barnacle wifi tether
hero of sparta
these are apps that I installed right before the problem happened and without these my phone works fine I am going to see if i can find that one that caused my problem.

It's not the maps update because my phone works fine with it.

It was hero of sparta a gameloft game from there web market funny thing is its suppose to work on the vibrant while dungeon hunter which works fine would only give nexus as a check out option. Anyway im going to try to get a refund tomorrow.

I get the same touchwiz reboot but for me it has only ever happened while using google maps. I do not use set cpu, but I have applied the gps fix. It is more than a little annoying. I have done a system wipe but the problem persists.
Sent from my SGH-T959 using XDA App

yes, if you have setcpu, uninstall it - its buggy with the galaxys
- sometimes you can't wake your phone (if you set a screen off profile), forcing you to do a battery pull
- constant launcher restarts

Judgement5 said:
For me it was another app not setcpu I never used it. After i did a reset i restored all my apps with titanium backup and once i restarted my phone it looped again. So i did another restore and left off all the apps that i installed right before the problem started and so far i think for me at least one of these caused it
Google maps update
google translate
the extra language pack for translate
barnacle wifi tether
hero of sparta
these are apps that I installed right before the problem happened and without these my phone works fine I am going to see if i can find that one that caused my problem.
Click to expand...
Click to collapse
and this is why i started the thread, to make sure i wasnt all alone. i have everything you have installed as well, but it was doing it before i picked up hero of sparta (and nova, and asphalt 5, man those guys make some good phone game lol).
anyways i just installed barnacle wifi tether yesterday so thats not it either (at least for me). That leaves the google stuff, out of the apps in your list, all of which were installed when i first got the problem, and are still on there after I've removed setCPU

heygrl said:
Root will stick but settings and apps/app data will be gone. It briefs you on what is and isn't lost when you do a factory reset.
Click to expand...
Click to collapse
ok so, contacts, text messages, etc stay? Meaning if i do a factory reset, root stays, and all app stuff can be taken care of by, say, AppBrain since it has a running list of everything installed and knows where to get it to install it again? I apprecicate the advice, but this would still be a last resort sort of thing. my phone has worked fine for the past few days but I also havent restarted it yet either

just a quick update, my phone still does this if i reboot my phone (which is never now that i got my 32gb sd card), but for the first time ever hero of sparta caused it to happen while the phone is on. I uninstalled it so we'll see.

Phone crash after battery died!!

my battery was running low, (and coz poor battery issues with JPY), i didnt notice when it switched of. normally i use the power button to turn the screen on to unlock, but instead i realised the phone had been off as it was now booting up...it booted up fine went into the homescreen and then vibrated once and powered down.......now it was powering down for a long time and occasionally there were vibrations and the lights on the home keys were constantly on. the screen was black. i got home and tried to charge it but the progress bar showed no progress on charging, i tried to switch it on but it would go to startup screen vibrate cupla times and power down. so eventually had to do a hard reset in recovery mode. tried every option but in the end had todo it by wiping data.
now the thing is, is this supposed to happen? if ur battery suddenly losses power ur whole fone will screw up?
for future ref if ur battery dies dont try to switch ur fone on until u got some charge in it and use the home key to put screen on..

Sounds like it could have been faulty firmware .
JPY does not have a significant battery drain problem per se .
jje

Black screen, vibrations and no boot after restart
Hello! I had almost the same experience (Black screen after reboot and occasional vibrations) only mine refused to boot even after memory wipe and after flashing new roms.
Was your phone rooted? Because I think rooting a 2.2.1 rom (XWJS3) was the beginning of my nightmare. keep in mind that the phone was working like charm for two months. This was the second time I had a problem. The first time the phone started after performing a factory reset by itself!
In case this happens to you next time and for every non experienced galaxy player (like me) reading this:
Don't panic! Blank screen, vibrations and no boot doesn't necessarily mean a hardware problem. Finally I managed to fix it flashing eclair and repartitioning with pit512. Now I'm a happy XWJS8 user
And a question for the experts: Any clue why this happened? Is it really a rooting issue? Can a cheap Chinese battery from ebay cause this?

everything was stock on mine, no root.......maybe thats why i could recover it??!!

Maybe! and I hope the reason is faulty firmware as JJEgan says. If this is true, your phone will be fixed by the next update.

I was very urge... the same happened again. It's been a month of smooth functioning and now after a simple restart, the device doesn't boot for absolutely no reason (Stuck on black screen constantly vibrating). Since my phone wasn't rooted, and I haven't seen many people talking about a problem like this I suspect:
1. Faulty hardware (for a few devices including yours and mine)
2. A Bad app.

Contacts Vanished
Hey Everyone
Im having similar problems, i updated my sgs to the js7 version of froyo, then rooted it with oneclick method. this was as i got the phone a month ago. Its been smooth sailing since then. But last night the phone powered down and wen it loaded up it had no contacts, my sms where still there but all the apps had a force close issue none worked. so cleared the cache in recovery. Still nothing so i did a factory reset and once loaded up. i formatted the sd and internal within the settings option. So the phone was now clean. I then connected to pc luckily had backups so installed titanium restored all my apps n settings. Using kies restored my contacts n thanks to an app called sms backup i restored those.
So all was well and worked again. I didnt restore the apps i had installed within the last week to make sure it was not a faulty app. I was happy, but now tonight it did it again. No contacts again.
Pls help
Any suggestions

That's exactly how it started for me. One month after rooting froyo 2.2.1 Suddenly everything force closes and the device hard resets by itself. I reinstall all the apps and then after one month and performing a simple restart, it refuses to boot. Stays in a black screen and vibrates every some seconds. I flash a new rom but does the same. Problem solved after repartitiong and flashing original eclair with pit 512. Reflashed a 2.2.1 rom and everything works perfect (the phone now is unrooted and with a nice clear stock rom). But then after one month again (!) I realise that some videos refuse to play. Trying to restart and craaash. black screen, vibrations and no boot. Did the same again (repartitioning and flashing) and now I wait for another month to pass and lose an hour of my life to do the same again. No idea why this is happening. Is it possible that rooting messes with something that stays faulty after restoring the file system? is there an app that we all installed and caused this mess? please this is the most serious problem I've red in this forum and still a mystery. I believe this thread should be sticky and we all share similar experiences because this looks completely random!

I believe this thread should be sticky and we all share similar experiences because this looks completely random![/QUOTE]
+ 1

Unresponsive screen

Android 2.3, 407band, DSC 7.0 rom, Go launcher (default), Zeam launcher (secondary)
Today while using an app called wallbase, I hit the home button while the app was setting a wall paper for me (normally I wait until it says wallpaper set). The home screen popped up but then Go launcher had a FC error (which it has never had since I've been using it). It had the option fc or wait I hit wait. Next my wall paper went black then my screen followed by two vibrations and a notification sound I never heard my device make.
I rebooted to the lock screen with a black background and no service on the screen. It was unresponsive to my touch and after about 10sec. it gave the same two vibrations and sound from before then shut the screen off. The power button did not turn on the display so I had to hold it down for about 20sec for it to reboot to dell logo. From there i went into nandroid and flashed severals roms loaded to the lock screen, rinse/repeat, to find the same result (simple streak, streakroid, older version of dsc).
I reset permissions, wiped cache and dalvik, calibrated screen. Want to avoid a factory reset because I don't have a backup.
Help guys? Mods please move to the appropriate forum.

If all fails and you don't have another alternative.
install the DSC v0.70 update, it shouldn't delete your 'data'.
I would backup your streak, better be safe than sorry.

So I tried letting it sit with the battery out for the night (6 hours) and booting it up this morning with the ac charger. It loads to the same lock screen (standard screen with black background and no service on screen) and all my start up apps loads, it even showed me a text notification. I did notice that the time was wrong though and never changed.
Any one have this issue before? What suggestions are there to combat this? The G.Note doesn't fit into my budget right now. May have to factory reset this and sell it as a last resort.
Help guys?

Outlook for this issue looks grim. Seem others with a similiar issue on different devices have had to factory reset or return it to manufacturer.
Before I do that, is there are any possible way for me to backup some of my app data?
Anyone know if Dell still helps with this device?
I use the app cadrebible often(its the only one I really care about) but it doesn't auto sync/backup and my last manual backup must be from Dec2011 - yea makes me want to cry.

I can load into fastboot, so is there a way I can uninstall a few apps I suspect are causing the issue? Move files from the phones to the sd card/computer?

factory reset. Mod feel free to close thread. -- yes im crying.

Did you try calibrating the touch screen?

Safe Mode!

I'm starting to think I might have something wrong with my Note. From time to time I'll turn on the screen and go to do something, but it'll freeze, then go black and make the chimes sound it does when booting up. At first I thought touchwiz was restarting since it doesn't always make the chime sound, but now I'm pretty sure it's doing a full reboot.
Yesterday I got the freakout reboot, but this time it booted up into Safe Mode! I didn't even know there was such a thing on Android, but see the attached screenshot. It clearly says Safe Mode in the bottom left corner, and it deleted several widgets from my home screens, and in my app drawer it removed most of the apps from the folders I'd created, but left the folders.
Rebooting took the device out of safe mode, but didn't fix my foldered icons or home screen widgets. Pretty annoying.
Anyone else had any Safe Mode experiences? Any idea what might cause a spontaneous reboot into it?

Since you have AT & T in your profile, could it be that you're posting in the wrong thread?
If you have AT&T Galaxy Note I717, you should go here for assistance:
http://forum.xda-developers.com/forumdisplay.php?f=1494

Restart your phone. . My little boy managed to put my note into safe mode (dont ask me how cos i cant work it out how he did it) turning off the phone and restarting puts the phone back to normal
Sent from my GT-N7000 using xda premium

You enter safe mode buy touching the menu button while the phone boots. If you are not touching menu, then some ap/ software is causing this. Try a factory reset to see if that resolves the problem.

chasmodo said:
Since you have AT & T in your profile, could it be that you're posting in the wrong thread?
If you have AT&T Galaxy Note I717, you should go here for assistance:
http://forum.xda-developers.com/forumdisplay.php?f=1494
Click to expand...
Click to collapse
No, I have the international Note. I did just buy an AT&T version, too, but haven't started using it.
I did reboot back into normal mode already. I was mainly wondering if booting into safe mode was responsible for removing all of my aftermarket widgets, non-stock app links in the bottom quicklaunch section, and taking everything out of the folders in my app drawer except for the stock apps. I guess I'll start removing apps and hopefully the problem will go away. The spontaneous reboot happens probably once every other day on average, but just to safe mode that once so far.

my phone used to go into reboot loops often and also very predictable. widgets would not load properly too.
The problem as per me is a buggy apps 2 sd move occurring in the phone (reproducible event every single time i recreate that situation).
Solution that i found the hard way after a lot of trial and error and a lot of frustration (needing to repeatedly reload all my apps) was to go into application manager and delete any apps that are present but blanked out without logos. They are always some apps that have been moved to sd card improperly by the phone.
Sometimes when you try to move many apps fast to sd card in sequence then the move isnt done properly and you get application manager showing the app size as 4kb or 8kb or 12kb etc when the actual app size is many times that or even several hundred kbs or mbs. you will need to uninstall all these apps and reinstal them slowly one by one instead of autoupdating market apps which just recereates the problem if the app has already been moved to sd card.
Also another reason not to auto audate apps that have been moved to sd card is that sometimes when you have many apps then this auto update feature when moving it to sd card does it improperly and previous properly installed app after the autoupdate will cause the device to crash because the sd move is buggy and when you go through application manager then the app size show is at variance with actual size and usually just shows 4kb 8kb or 12kb etc instead of usual size. You will then need to uninstal these apps and start all over again.
Since manually moving apps to sd one by one and removing autoupdate for these apps i havent had issues usually.
Once the phone even got stuck on data signal only and would not let wifi on and when ever switched on it would immediately disable it autoatically. couldnt solve this by rebooting or deleting apps or firmware update (not rooted) and had to do a factory reset to sort the problem.
This is not an issue with sd card as even brand new sd cards cause the same issue again. The problem does not occur if all apps are on internal memory or sd card is removed. so guess it is an issue with phone being unable to properly work when many apps are trying to access info on card that it cant access because of improper transfer to sd card. phone then freezes and goes into reboot loops sometimes for 8hours at a go! only sorts itself when the apps are deleted and works ok when same apps are reinstalled properly.
ps: wondering what the safe mode does though and when it is useful to start in this mode? any pointers anyone.

once i accidentally removed the battery while the phone was on. When i put the battery back and restarted it, it booted in safe mode.

Mine just went into Safe Mode. I had rebooted the phone and put it in my pocket whilst it was rebooting. I rebooted normally and got it out of Safe Mode. There is one very annoying thing and one quite good thing that has resulted from this though.
Annoying thing: Many widgets now need putting back onto the home screens
Good thing: All Apps in the App Drawer are now in alphabetical order !!!!

Use app zorter from the market or clear data of touchwiz. All downloaded apps will be sorted automatically.
Well I had safe mode once after unexpected reboot. Still wondering what the reason was.

I have random rebooting issues with my Note as well. It hasn't always done this but it has been happening for the last few months and it'll generally happen once every couple of days. It does seem to be somehow related to moving apps around as mentioned in previous posts because I've had apps fail to move to SD a couple of times and it has rebooted once or twice whilst in the middle of trying to move an app to SD. It'll also sometimes reboot when auto-updating an app as I can hear the boot sound happening at times when I'm nowhere near the phone. I don't have any apps showing up with a dodgy icon at the moment but I have seen some stuff appear like that in the past and the only solution was to uninstall and reinstall the app; although that's only fixed the app in question, it's never solved the general rebooting issues. The phone will also sometimes lock up and reboot when trying to launch application (this seems to happen more often with newly installed apps at first launch, but that might just be a coincidence).
The only other odd thing I've noticed, which might well be completely unrelated, is that the shortcut for one particular app (the full version of "Where's My Water?") continually disappears from a folder of shortcuts on my main desktop screen. The app itself is usually still on the phone and will happily launch from the app drawer, but if I create a shortcut anywhere else it will always disappear again shortly afterwards and it's literally the only app this happens with. The only reason I mentioned this as possibly related is because the app has appeared with a bad icon once and had to be reinstalled again as if the phone had lost track of it on the SD card.
Anyway, I do get the feeling that the reboots are happening when the phone can't find something on SD storage, or when it can't get data on/off the card fast enough or whatever. God knows how you'd get to the bottom of this or solve it though; the ICS upgrade will probably force me to do a factory reset of my phone so I'm hoping the issue will just fix itself as part of that process otherwise I'll just need to put up with being annoyed at it.

Verizon i815 random reboots

Had my Verizon 7.7 i815 since 4-30 and love it except for one issue - it reboots at least
once a day usually when its connected to the charger.
I need help figuring out if this is a hardware issue so I can just exchange it or if is
software/other issue that I can resolve myself.
When it reboots it goes to a black screen with a single white dot in the center.
It is playing the reboot jingle when this happens.
Sometimes it will bootloop and I have to press the power button for a few seconds to
reset the tab.
Honeybar is installed and AdwLauncherEx is the launcher.
I have tried booting to stock recovery and clearing the cache and did a factory reset - didnt help.
The tab is rooted.
I also removed the Sandisk 16gb microsdhc card after a reboot at 5 am because I had read about users who were having issues with their tabs until removing or switching out their sd cards. The tab went without rebooting after that for 19 hours until I installed
Hidebar. After installing hidebar the tab rebooted twice within a minute so these two instances may be because of that app. I uninstalled it after that and went back to
Honeybar.

I have only experiened a white dot reboot when trying to swap the phone.apk (it was a never ending reboot). I otherwise haven't had it reboot on me. I don't use any bar hiding apps.
Sent from my SCH-I815 using xda premium

Just to be clear my tab was having the reboot issue long before
I installed hidebar - I only installed hidebar tonight and have
owned the tab for a week.
I am however able to cause the reboot consistently with hidebar.

Well the reboots started again after almost an entire weekend reboot free.
Going to exchange it at Verizon for another 7.7 tonight.

Good luck! hopefully the new one is error free.

I've had the same issue with mine, also a vz 7.7.
It was happening in a loop the other day and I managed to capture a video of the entire sequence.
I don't actually think this is a reboot but instead seems to be more of a screen and radio lockup.
I get the little dot in the middle of the screen. After 20 seconds or so the tab goes back to the lock screen. Once unlocked it has to re-connect to either Verizon or Wifi.
I tried disabling the wifi and 3g/4g networks and this seemed to improve the situation but yesterday I was able to get it to do the same thing with the radio's disabled so probably not chip related.
I'm still within my return window I think. Seriously considering returning the thing mainly due to this problem and the lack of ICS.
Had a GT8.9 previously and even though the screen isn't quite as nice it was a pretty great tab and cost half as much *and* can access the awesome AOKP ICS rom.
--tr

Yep, development for this tab is non-existent at the moment.
I'm stickin' it out tho and hoping for CM9 sooner or later.

Same here. I can't find a pattern to what triggers it. The first time i was installing a bunch of apps from my computer via Google Play (not tethered to PC). I pull my microsd and sim and it continues for several cycles. Did a bunch of the stuff you did also w/ clearing the cache and actually the first time i couldn't get it out of the loop (it would actually get into the desktop where it looks like it would be ok, then suddenly screen w/ the white dot in the middle and looping again). Never got close to depleting the built-in storage, so that's not the factor.
Sometimes I can get it to stop by turning it off by holding power down and turning it back on again. It doesn't happen a lot, but it's freakin annoying when it starts.
I don't have honeybar, but am running ADW.

Wow, good to know others who are going through the same issue...I thought I was the only one! I still have the reboot loop issue even after performing a hard reset. For me, the reboot loop only occurs when I'm on a cellular connection. If I'm on wifi or on airplane mode, it doesn't happen. I'm well past the exchange/return policy so this is extremely irritating.
Personally, the most frustrating thing is that my tab will be fully charged at the start of my day, then in my bag for the morning while I'm at work and then, when I take it out to use it, the battery is completely drained because of the reboot loop!!!
I'm hoping an update (ICS?) will fix the issue but I'm not holding my breath for it...

Same issue here. I am rooted, and originally thought the reboot was from Gesture Control app (awesome app!) when hiding navi bar. But after reading this thread, I'm not so sure.
I've only had the reboot loop once, here is my setup when it happened....
-had just unplugged from charger after full charge
-Mobile data was off, Wifi was set to sleep....never when plugged in..
-The device kept rebooting, so I powered off, went into recovery, wiped cache. I also turned off Gesture Control app functions (not sure if this was necessary however). This seemed to stop the reboot loop.
Would be nice if we could keep gathering info on the conditions that cause this, and potentially find a solution. It sucks having a dead tablet because of this issue.

My 7.7 does the same thing. I don't use the tab constantly, but I do notice the reboot on a fairly regular basis. Same symptoms as everyone above, except for me it doesn't go into a loop, it just reboots once with the white dot and then comes back fairly quickly, so not really a full reboot. I don't see the Verizon & Samsung splash screens, just the white dot then the login screen.
Mine is not rooted, has the stock ROM, and does not have any UI enhancing apps or mods. It's pretty much stock other than having applications installed, and nothing that really runs in the background because I have Advanced Task Killer kill auto kill every 30 minutes.
Not that big of an issue for me right now, but would definitely like to see it resolved.

gawd! It doesn't happen a lot, but when it does it's friggin annoying. Yes, it's the white dot and doesn't show the full bootup splash, kinda just goes to the desktop again seems ok for a minute and then boom- black screen w/ dot in the middle and it starts over again.
This last bout was pretty bad and it didn't respond to shutting it completely down by holding the power button and letting it boot again, which has sometimes fixed this in the past when it's looping like this.
Can't tell what is causing it, at first i thought maybe a live wallpaper, the 64GB sandisk microsd card, or a faulty sim (sometimes my tablet says SIM not inserted, even if it is). I tried changing all of those but it still happens. I haven't found a pattern of usage or other type of trigger to make it do this though.

I've only ever experienced this when I tried adding in the mms and dialer app from the GSM 7.7. Otherwise my tab has been rock solid.
Sent from my SCH-I815 using xda premium