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You will have to give us more info on the issue, you can also repair the phone with XC and report back.
it's a known iussue. there are many topics about it. I have this problem too sometime. The brightness bar moves alone up and down continuosly...but in some occasion only...i don't understand why...
it may be software or hw iussue. hope sony will solve it with a new fw if it is cause of the sw.