TV turning itself off and on may be a button short in the remote. Remove the batteries to see if the remote is the cause. If your problem goes away, check inside the remote. The contacts are shorted by rubber impregnated pads. If there is too much of the contact solution, it will continue to activate the contacts without the rubber pad pressure. Remove the "oil" with a swab and be sure to remove the oil in the recesses.
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Video showing the "grease" on the keypad https://youtu.be/7H1H_g7Ks94
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