Just got my new HD hooked up today. I'm moving from an HR10-250. Any button press with the remote, ie. to bring up the banner or scroll through the guide, my audio briefly drops out for just a half sec. Then it comes right back. After three or four presses (like when scrolling through the guide) it drops every other press or every third press. Strange. I don't get any audio drops while just watching a show and it doesn't drop while watching a recorded program when I bring up the banner. I have experimented with SD, HD and OTA channels and it doesn't seem to make a difference. I even unplugged and restarted again with no change. I'm stumped. I'm using the optical out that feeds into my Yamaha receiver. Never had anything like this with previous Tivos. Any ideas?