Do you mean that your phone is resetting it self all the time?
In that case, do you experience the same problem if you start the phone in safe mode?
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
If the problem remains in safe mode I suggest that you repair your phone software using PC Companion:
http://www.sonymobile.com/update
In PC Companion, press start on Support Zone > Start on Update the phones software > Press the blue link 'repair phone'.
