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My Xperia T has suddenly become a lot hotter in use with temperatures recorded upto 54C. Is this OK or is there some problem? Seems to have happened since the new update this month
I recommend booting in safe mode,see if it is related to a 3rd party app:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008