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Repair the phone with PCC, if you encounter the same issue, then contact your Local support as it could be a hardware issue
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Hi @sssj92
Welcome to the community.
Here's how to run the repair on PC Companion:
And Bridge for Mac:
6 . Select your model of phone from the list that appears
You will want to start these processes with the phone powered off and disconnected from the PC.