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I agree with AbMagFab. Whenever Comcast says the "signal strength is fine" be wary. It seems that my Series 3 likes signal strength greater than 90 (whatever that is in Tivo speak). Whenever the value hovers around 86 and below pixelization starts on my unit. Picture goes away at 76 and below!

I installed an amplifier. Be careful of over driving the signal. Something on the order of 15db should work (but this depends on the quality of the path (wiring plus splitters) between the point where the cable enters you home to the Series 3). I've used amps from Channel Vision for a number of years

If I get signal strength readings of at least 94, all images and sound are perfect on my unit. Your situation my be different from mine but it looks awfully similar. Remember neither Comcast nor Tivo ever thinks it's them. It actually may be both companies! Good Luck.
 
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