I'm using tivo hd with ota and analog cable. cable guy is coming on Tuesday to install cablecards. i did a quick search but I don't see my issue discussed anywhere...my tivo keeps reverting back to fixed 720p. For example, I set it to hybrid, and it stays on hybrid, but over time it reverts back to fixed 720P. I have not figured out if any particular action sets it back to fixed. Anyone else notice/experienced this?