"Dynamic Range Window violation"

Bottom line. Are you actually experiencing any connectivity problems ? If not, don't sweat the log entries.

Even though the signal stats looked o/k at that snapshot in time, the error log entries confirm 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 can check the CMTS (Cable Modem Termination System) for any real time degradation and / or error reports, see your node / cable plant and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and poll for those upstream receive signal stats.

You should get a reply here in your topic. Good luck !

Yeah, I don't really get my speeds usually half most of the time and sometimes reboots. I looked this problem up in other threads and wanted more insight. Almost all threads say there is a problem somewhere hence why it's saying it.

Greetings, @deox! I appreciate you taking the time to reach out to us here on the forums. I hope you are having an amazing day! I apologize to hear of the issues you are running into with your internet. I know how important a reliable connection is these days. I would like to take a deeper dive into the signal and see what could be going on. Can you please send me a PM with your first and last name so I may further assist you?

To send a private message, please click my name "ComcastMichael" then select "Send a Message" on the right side.

Did this issue get resolved?  I seem to be having the same issue with the same modem. 

Thanks,

Josh