I'm using a Direct tv HD Dvr sat box connected to the Denon and then to my Vizio Tv with hdmi cables. I've noticed that I keep on getting a sound drop out while watching tv shows hear and there. Its like someone turned the volume down quicky for a split second. I can rewind the dvr and it want repeat this at that same point.
Hi stereo12, most likely its the cable box. Does this happen with other source as well? Try setting the cable box audio output as stereo and see if the problem reoccurs. Or try doing a soft reset on the cable box or use optical cable from cable box.