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Repair your phone with SUS or PCC, if you have the same issue, take it back to the store
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
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I had the same problem 3 days ago while i was taking pictures randomly the camera said it is not avalible till i restarded the phone.
I had the same yesterday, I needed to reset the phone via the red switch next to the sim card.
It's a small red button, press that and them power back on and should be back to normal.