Hello,
ever happened to someone with the plasma TV or lcd that suddenly begins to cycle the channels continuously? no longer answering the remote control. The only way is to leave it without power for several hours. Afterwards turning it on it will work properly but after half an hour or one hour of regular work it will start again to cycle the channels uninterruptedly. The workaround is only to keep it disconnected from main power, however after some time it always resume its crazy channel cycle. It does not depend on input (whether it's HDMI, analog, terrestrial or cable source) or from the remote control. Unfortunately TV is out of warranty since a long time.
Thanks for your suggestions