Some time today, the downstream signal strength and SNR dropped on my Tivo and modem. The upstream power also increased.
The modem signal strength is within spec (dropped from +4 to 0), but the SNR dropped from 43 to 35. The Tivo has it worse. The signal strength there is 80% with a SNR of 31 (usually it's 40). I saw a huge number of uncorrected errors last night, but currently it appears to be stable.
At the moment, I'm not seeing any picture issues or speed problems on the modem, but something obviously changed for the worse. I think a SNR of 30 is the lower limit for Tivo. Comcast normally won't come out unless there's actually a picture or speed problem. Any idea what to do here?