To start my phone has not been dropped or gotten wet and has been in a case since day 1. A little over a week and a half my phone would randomly reboot/restart through out the day. At the time my phone was on D85120b and it was very sporadic so I didn't think much of it. My phone started to get worse and worse each day. It got to a point which it was unusable and multiple apps were starting to get buggy. Then I started to get constant error message android.process.acore has stopped every 2 seconds.
This morning the phone stated that there was an update available (D85120e) so I hoped this would fix the issue. Boy was I wrong; as soon as the update was done it went on an endless restarting loop. I was able to stop it by connecting it to my PC via USB and I proceeded to clear all the cash via storage menu....no luck. I then proceeded to do a master reset via buttons as the phone started to endlessly reboot.
After Master reset was completed I set the WiFi and logged into my google account. As soon as I put in the 2-factor verification code BOOM reboot.
Needless to say HELP!!!
Best answer by mjmarcial
**** Update *****
I got the replacement battery yesterday and it has been working great so far. I still got the android.process.acore message but I found online that uninstalling Facebook does the trick and thus far it has worked, no messages!