Check the tv menu setup,check for the sleeping timer it is not on like Sleeper modes or timers,make sure it not on like 30,60,120 mins.Should soved this promblems,if not tries find the new version of the tv firmware on the manifacture website make sure it correct tv make model tv software firmware and down load it to a flash drive uploaded to ur tv,this is a once time shot only.Don't make a mistake or u have to replace the whole main mother logic board.
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