Just noticed a problem. I put it on the Sugar bowl last night (over the air)and after watching for a minute, I got some small black bars in the top left with writing in them. When I switch to a regular sat. channel it is still there. Unplug the 811 and it goes away till I watch over the air programming again. Then it is back, if I leave it on the channel it goes away then comes back. Any ideas what this might be?