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Yesterday i installed the new version of android, after installation, Screen is blinking while making the calls.
I think xperiaz performance was low after the update
That seems strange, have you tried to do a repair of the phone software?
Click on this link to get Sony PC companion:
http://www.sonymobile.com/gb/tools/pc-companion/
Start PC companion, start "Support Zone", start "Update phone software" and click on "Repair".
Follow the on-screen instructions.