I'm seeing these artifacts, they look like full screen white flashes but when recorded in slow motion they're grey boxes that expand across the screen. They vary greatly in frequency from 15 seconds apart to minutes apart or not at all. They don't show up when playing videos on the tivo itself...

So it seems that many of the networks that may have used to broadcast in 1080i are broadcasting in 720p and its noticeable.. what are supposed to be smooth background gradations have blocky artifacts, as do curved shadows in darker areas especially on faces. On top of this they're doing some...