The D installer arrived at 9am sat (8-12am time slot). Nice guy, actually an out of work civil engineer who had only been with D for two weeks. I moved from HD Tivos and prior to that an SD Tivo. I have been very concerned about the move. So far, I like the new boxes, but within 24 hours, one required me to pull the plug to reboot. I was watching the last 1 minute of my football game, and the screen went black. At first, menus worked, but no video, then within a few seconds the screen was just black. Is this a known failure mode? Anything I need to watch for?