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Download sony update service and attempt a repair,it should fix your phone.What software version do you have?
You updated to 4.3 via sony update service?Reinstall the software.
Download sony update service,install,run it and follow the steps given to repair.Did you install any task killer before the event occured?
Yes,I suggested the repair because it works sometimes,but if you wish,you could just exchange the phone.
I understand,I say you see how it works after a software repair.If nothing improves,take it back.