/t5/Xperia-Z2/Ultra-Stamina-Mode-Bug/td-p/901767
i had the same trouble 2 days ago but my device didnt reset itself.I stuck in ultra stamina and normal mode both mode didnt work properly.In normal mode i couldnt see the most of the apps in menu so i returned to factory settings and it was ok. ( i guess ) After that i upgraded the device to 5.0.2 from 4.4.4 with PCC successfully But i realized the device works very very slowly in some apps.For example , i try to delete sms conversation ( 2-3 message inside ) it takes 30-45 sec. 500-600 message conversations takes hours. ( i use default sms app and i reload only sms messages from my backup files ). Or chrome , wellknown x website works fine but another smilar wellknown website works like in windows 95. Or another example, everyone knows Looney tunes dash game. After 10 secs run the app , i barelly move and max 1 min later device burn like **bleep** and restart itself. But i can play asphalt 8 without any trouble.
After the lolipop upgrade i repaired device with PCC ( Press and hold power & volume up for 10 seconds > connect your phone to a wall charger > let it charge for 1 hour > on your computer run PCC > repair/update > do NOT turn on your phone > follow the steps and try again.)
turned factory settings twice but nothing changed.Also i tried safe mode and get the same result with chrome.
I'm pretty sure device has another troubles that i dont realize yet.But i guess these examples enough to explain my trouble.Should i send the device to sony for repair or can i fix this with some help ?
