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@Dale2
Boot on safe mode and see if you experience the same, if you do then repair the phone with PCC
software repair
PC Companion (PCC)
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
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The problem its a third party app creating this problem, you will have to uninstall one by one until you find the culprit.
Anytime