I have the above tv in my 5th wheel trailer and it has dolby digital/HDMI. Over the last several weeks, the tv will freeze up and no signal will come in. When I rescan the channels none are shown. If we leave the tv off for several hours and restart, we can rescan the channels and enjoy all the channels that come in via the antennae. It will run again for several hours then shut down again. I can use the av portion of the tv anytime. I think this might be a heat issue on one of the circuit boards. What are your thoughts?