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After taking 5 or more photos,the camera is still.And it is work after shutdown the system.
Settings-apps-all-camera,force stop and clear data.Restart.
If that doesn't work then repair your phone with SUS or PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
It is not resolve this problem! I have the same problem and I sure that it is SW problem. My position is test engeneer and and I know that I speak. Please bring to programmers that they submit new major CR (Change Request) in their bug tracking system such as JIRA or the same.