Frequent brief disconnects

Is there a router ? WiFi connection in the mix here ?

If so, for a test, does a computer that is hardwired directly to the cable modem have the same problem ?

With this test, we are trying to isolate this down to being either a WiFi-only problem or a problem with the general connection to the Comcast system which would of course affect both. It's a good first step of troubleshooting before proceeding any further. 

Hey EG

It's affecting all devices, hardwired and wireless. There's a router, but I've tested hardwired directly into the modem as well and the issue persists. Entire run from modem to pole outside the house is relatively new and was verified as good by various techs over the last couple years when they've been out here for other things. No splitters.

It's an issue that occurs for a couple days and then is fine for a month, give or take, before happening again for sometimes up to a week. Sometimes the drops are barely noticeable but yesterday was particularly bad. When it's less bad you won't notice it with things that buffer substantially like Netflix, but it still makes conference calls or working from home or gaming impossible. When it's bad like yesterday the disconnects can last longer than a few minutes and occur much more often.

I think my numbers in the tables above look pretty good from my limited knowledge, which tells me that it's not the result of a continually degraded connection. The majority of the time, when these blips aren't happening or are mild enough, the connection is otherwise solid. It feels like something is going on or fluctuating between the pole and the Comcast substation (unsure what the official name is) that I'm connected to, or some parameter at the station itself is out of wack and needs to be adjusted, but obviously there's nothing I can do about that.

Thanks

O/k so even though the signal stats looked good at that snapshot in time, the error log entries confirm that something is going on. Perhaps there is noise ingress into the line(s) / an upstream channel-return path impairment 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 (Cable Modem Termination System) to check 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 !

Thanks, I appreciate it!