K850 Screen Goes Black And Then Vibrates And Restarts???

[ia015]

My k850i does exactly the same thing, mine is 3 years now and its modded with all stuffs and I thought it was that as made it but I see now that even new does it, so its a hardware issue right? And no, I charged my mobile and after about 80% started to mess like this...

EDIT: I've re-installed the software plenty of times with SEUS and it remains.

[hyperion17]

Try also this:
1) Start up Aerix, and press unlock
2) Remove battery, reinsert, and plug in USB cable, using 2+5
3) Wait
4) AS SOON AS IT SAYS "RESTARTING PHONE" HIT ABORT
5) You should get numerous error messages in the log
6) Open up D-Ultimate Unlocker
7) Choose your phone model, "no lock change", "no certificate change" and make sure only "REPAIR EROM/SEMCBOOT" is checked
8) Plug USB cable in, while holding 2+5.