Z3 turns off by itself

[Kilek]

Hi, mi Xperia Z3 turns off by itself, as long as I use it it works ok, but when I dont use it sometimes i found it off

I tried to repair with PC companion and the problem still there, so if there is no solution I will send it to repair

Also, when its low of charge, the screen suffers tearing (¿?¿?)

[Phy]

This might be a hardware issue, contact your Sony Xperia local support
http://support.sonymobile.com/global-en/contactUs/