You did not mention what the source is that you are viewing. Is the television connected directly to an antenna or cable coax, or are you using a STB (set top box), DVD player or other source?

If you are using one of the other sources, a bad cable connection could create similar intermittent problems. Sometimes removing and re-seating the cable can clean off oxidation on the connector pins. Also, cables sometimes themselves do fail.

Please provide a little more detail on your situation.

Thanks Yose, Well comcast is who is suppling the feed but about 6 months ago they provided a little digital converter for TV's that didn't have a digital box. I did check that the cables were in and tightened but you bring up a good point. I will disconnect it from it's source and try and hook up a computer to it and see what happens. Thanks I will try it this weekend and see if it changes things.