Can anyone shed any light on why I would have a few garbled HD channels on an intermittent basis? Specifically, it is four channels in close proximity to each other (432, 434, 438 and 439). I've swapped cable cards without success. Comcast is blaming the Tivo (of course) but I'm not convinced since it is an intermittent problem. Here is an example of the diagnostics screen for channel 432 at a time when the signal is garbled: Tuner: 0 Channel 432 Frequency: 79000KHz Modulation: QAM 256 Program Number 2 Signal Source: Cable Connector Type: RF 2 Channel Bits: 3176474 Signal Strength: 98% Signal Lock: Yes Program Lock: Yes Search Complete: Yes SNR: 39dB RS Uncorrected: 137465667 RS Corrected: 393361744 RC State: Available Current Tuning Status: Tuned: Success Tune State: In progress etc. Any help would be appreciated.