Just joining the party with this issue. TiVo tech support is suggesting attenuators which I have not found to try yet. I did try three separate cable cards -- all of which worked fine in my premier on the same exact cable line. TiVo tech support fixated on the 100 signal strength, i also have 42 SNR Picture quality is terrible, massive horizontal disruption. It seems to clear for about 2-3 seconds, then goes back to garbled for 10-12 seconds.