Share your experience!
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I'm sorry to hear about the issues you're experiencing. I suggest that you try to repair the phone software using PC Companion..
Before repairing your device you may want to backup your information first. Check out this topic for more information on how to.
How to backup?
If the issue should still remain I think that this needs to be examined and fixed at a repair center. For more information about how to submit your phone for repair and where, contact your local support team.
I'm having excactly the same problem on FW 17.1.2.A.0.314 and Timeshift video. Autofocus keeps pumping all the time. The videos are useless.
The same problem on my new Xperia Z2 witch updated firemware. Autofocus worsens the quality of recordings.