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Things to try
restart the phone
boot on safe mode
try a different pair of headphones
repair the phone with PCC
How to boot on safe mode
How to repair with PCC > run PCC > support zone > repair
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
If everything fail, contact your local Xperia Care
Another thing you can try Hishampvs, is clearing the data for the Smart Connect app - Settings > Apps > All > SmartConnect > tap Clear data.