Signal levels are all showing around -1 power and SNR of around 40 on all 31 channels.
What do the upstream power level figures look like ?
Stats are good. Please also post the modem's error / event log entries.
The signal stats are o/k but the error log entries indicate that something is going on. Perhaps there is noise ingress into the line(s) somewhere.
There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.
I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They will be able to poll the CMTS to see whether or not everything is in the green zone, see your node / cable plant and modem health, and also see a history plot for the modem. You should get a reply here in your topic. Good luck !
I can take a deeper look into your account to see if I can help isolate the cause of your speed issues.
Can you please verify your first and last name in a private message, as well as the name of the account holder if it's different than yours? To send a private message click on my name "ComcastChe", then click send a message.