After 2 days of using the phone with 8.3 weird stuff happened. 1) letters on keyboard started to stack for a while after I type a letter 2) I see the font of alarm on the unlock pin screen And the most weird first time to experience Seth like that: 3)after I open the phone when the screen turns off most of the times the phone also shuts down. Only solution to power it on is with hard reset. With normal one button power on it didn't open. W.t.f?????? I did a clean restore cause with reset settings nothing changed. I ll see how it goes.