Share your experience!
Repair your tablet once more with SUS and if that doesn't work, take it to a Sony repair center
Uliwooly is likely correct on how to fix this, however does it happen when you are doing anything in particular?
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Take it to the Sony Repair Centre, they should replace it for you.
Had the same problem, they replaced it without a fuss. (I live in Japan).
Do backup your data though.