The phone turns off by itself. Just the screen goes blank.

[XELLA0103]

Телефон выключается сам по себе. Просто гаснет экран. Процесс выключения отсутствует. При включении

The phone turns off by itself. Just the screen goes blank. There is no shutdown process. When turned on - GT

[Uliwooly]

@XELLA0103 

Your post was edited as this is an English only forum, you can use Google Translate to reply and/or post.

Remove the SIM and SD cards, see if you experience the same issue, if you do, then you might have to repair the phone with Xperia companion, keep in mind that it will delete everything on your phone.