That tv input it is could be shorting out or it dying,if it is ramdomly switching to other inputs.Tries tv unplug,replug the tv back like about an hour later for the tv to a resetting itself.Go into the tv Menu go to PICTURES,go down to do a resetting to do a whole resetting of the tv Tuner signal board to go back to the factory setting,this problems should be solved.If not just used and connected other input ports connections on the tv.
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