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Ours used to do that - and then we moved it to another state with us. Since the move it doesn't shut itself off anymore. I suspect that the problem was dirt and dust inside which got knocked loose in the move and the shutdown was due to thermal limits being exceeded. You may want to try vacuuming or blowing out the dust inside if you feel comfortable opening up the unit.
Unplug the TV from the wall, leave unplugged for a day or two, the TV may reset itself. You will lose all the programmed channels and may be other stored settings. The best is to get a universal remote for $10 or less.