For the past six months or so we've had a problem on our HD TIVO where the picture and sound will suddenly black out for about 10 seconds and then come back on again. This happens on live TV and recordings. When you rewind, the picture and sound come back again, but only if you play it back from somewhere in the middle of the blacked out region. If you rewind it too far and let it play back again, it will (usually) black out at the same spot for the same length of time... 90% of the time, but not always! The black outs happen all the time, but with no particular consistency. Sometimes it won't black out for hours and sometimes it will black out 4 times in a half hour show. We started out with the TIVO and TV connected via HDMI and were getting the bizarre "HDMI not allowed" message with similar black outs, so we switched to component and the message has gone away but the black outs stayed. This is driving our family crazy. Please help!