The phone keep rebooting itself

[marcin16v111]

My phone kept rebooting itself with the sim card in only so I have sent it for repair. It come back today "fixed" and problem still exists but it keep rebooting itself even without any sim card in.

[Uliwooly]

@marcin16v111

Repair the phone with XC and it will be wise to get a brand new SIM card. 

Xperia Companion (XC)

Software Repair Guide

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355

[marcin16v111]

I have tried XC and few simcards as well. No result. I have sent it today to sony repair center again. Hopefully they wont send it back without fixing the issue again. Anyway they have sent the phone without any accesories like charger and usb cable so physiccaly I couldn't deal whith the issue due to low battery not having any spare chrger or cable. Verry dissapointed so far.

[marcin16v111]

And after receiving the phone from repair center started rebooting itself without simcard in either.