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That sounds strange.Does the same happen in safe mode?
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
Simply try it,so we can have a clue if there is an app acting up.
If you have an antivirus,task killer it could be related.
i dont, ive been into carphone warehouse today thay have swapped the handset and its still doing it. ive been to the virgin store. he changed my prefered mobile settings from 4g to 3g. it worked for about an hour then started playing up again. (even he admitted he didnt see what difference it made) i have noticed another post on this forum with the same problem. is any one else on a virgin sim only contract having issues??