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What if you repair the phone with PCC?
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Hard to tell, if its a hardware related your local Xperia Care should be able to help you
if it's a software issue PCC could solve this issue.
Hi Finas93,
Discussion Welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines
I agree with Uliwooly on this, a software repair is likely going to resolve this issue.
No problem, let us know how you get on.