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Do you have a screen protector?
Strange,can you check if the same occurs in safe mode?
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
Keep the device in safe mode for some time. If it gets worse,perform a software repair:
http://www.sonymobile.com/gb/tools/pc-companion/
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