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In PC companion,yes.It will remove everything on phone memory.
Can you check if the same occurs in safe mode?
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
You have some 3rd party apps acting up,remove any battery savers,task killers.
You do not know how to uninstall?
Have you installed any particular battery savers? Or task killers,free RAM apps?