My Emerson 32 in led hdtv quit but gives me a message. “Resolution is mismatched”. What does that mean and can I flip a sw

Aug 3, 2018
The volume has been going in and out for a year but turned the cable box off and back on and it worked again. This could happen 4-5 times a day or not for a week. Last night it was horrible! It was going off every 30 seconds to 2 minutes. The the last time I turned the cable box off and it wouldn’t come back on. Then the tv turned off by itself. Before it turned off it showed a message that said the resolution is mismatched. I can’t find any reference for this from anyone else. Help please!!?