I've had some recent pixelation/noise on both my 2-XL and my 4 - XL with Comcast/Motorola and NO TA. Using CableCard diagnostics I seem to have consistent 30 SNR and 76 or 77 Signal strength and of course I've restarted both machines. I've swapped the home runs at an amp that I use with taps and no splitters.
I use a home run to each location with a tap and a lead to the television direct and the second to the TiVo. Each home run is equal length. I've by-passed the amp and eliminated my modem from the mix and did the TV/TiVo's direct with no change.
My SB6120 displays 36 dB across all four channels and -1 dBV & -2 dBV PowerLevel "down"!
Is it conceivable that a "hit" on the CableCards would help the siuation or do I just need to approach Comcast for a check of the "drop to the house"?
I've never had issues and best I recall my signal strengths on the install when the 4 tuners were released were 90+ at the TiVo's and the televisions.
The connection at the grounding block was done when I did the original install and appears fine.
The issue seems more prevalent on major networks and maybe worse at "prime time" BUT maybe because that's when I watch maybe more frequently.