This has happened once before, and a full restart of the Tivo fixed it. The blue bars show up on every channel once it starts happening, in addition to the main tivo menu. I recorded a bunch of football today, but I'm not sure if this causes the problem or not. Do I have a defective unit or is this a known issue? I tried searching but couldn't find any information. Most complaints w/ the tivo hd seem to be w/ pixelation.