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So in safe mode the phone works fine?It is an app acting up,you should consider a phone software repair.
What app have you been using?
Run the phone in safe mode,see if the same occurs.
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
how do you do that? the safe mode. thanks by the way for helping me on this. the restarting never happened again but just in case it does i'll do what you advice me.
I left you a link,you just need to tap power button,tap longer on turn off and a message will appear to restart in safe mode.