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Boot 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
You should try a repair with SUS:
http://www.sonymobile.com/gb/tools/update-service/
If this does not help,get to a sony service:
http://www.sonymobile.com/global-en/support/contact-us/