My Tivo has started causing a random sort of flashing. It almost looks like a problem with vertical hold. It gets some white bands that flash on and bounce up the screen. It is intermittant and random. I have done two hours of troubleshooting. It is definitly the Tivo. It seems to stop after the machine has cooled down and starts again several minutes after resetting. Has anyone else seen this? I hope the warranty is still good. This is my second machine. Should I have bought the Sony? I will call Tivo central tommorrow.