I have a new Denon AVR789 Receiver. There currently are 2 hdmi inputs -satellite tv and a dvd deck, and one output to the tv. When I set the receiver to tuner in order to listen to the radio, the sound cuts in and out -it will sound for 2 seconds and then silent for 2 seconds and will alternate like this indefinitely. If I turn the tv set on this "fixes" the problem. I can then turn the tv set off, and the audio will remain correct. The Denon tech support has no ideas. Anyone out there have any? thanx.