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Boot on safe mode and see if you experience the same issue
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
if you do, repair your phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
keep us updated
Then it's an app acting up, not a preloaded app but an app that you installed at some point
if you want to repair your phone
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355