turns on and about an hour later it turns off

turns on and about an hour later it turns off

My tv has the same issue it turns on and about an hour later it turns off, at first I was able to turn it right back on but now sometimes I can't i switched the adapter cord with my daughter tv but issues stills remain. I have a 50inch Sanyo tv that's not even 4yrs old and 2yrs of the 4 it was in my storage please help or any suggestions please

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