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Sorry to hear about your phone 
It's not something i've heard of before on Z2. I recommend that you contact your dealer or your local support team for asssitance. If the display looks like that there's something wrong with your phone and it needs to be repaired or replaced.
You can also reboot your Z2 with a RED Emergency button - Left cover near USB charging port. Press gently with a pen (no sharp needles!) and hold till phone restarts.