My HR44 started doing something very similar until they came out and replaced mine a couple of months ago. When the tech came out he immediately said it was in the HR44 and didn't have a problem replacing it. Now it's back. I'd say it happens about once a week. It usually happens when I pull up the guide and change to another channel. I get a silent, black screen. Regardless of how I change the channel, using the guide or up/down, I get a blank screen. Even my OTA channels are not viewable. When I try to play my recordings they all show 0:00 and will not play even though I can see they have recorded entirely. I have to do a reboot to get anything to work and I've tried every means of resetting the HR44. The most frustrating thing is that on some occasions I have been recording another show (sometimes live) when this happens, which means I lose 5 minutes of my recording while it resets. In the past I have experimented leaving it in the freeze mode to see if it will continue to record and it doesn't. Cables are not the problem. I have given thought to it being a faulty LNB but it went two months before it returned, and a bad LNB would be more problematic.