Lost Connections and Intermittent Delays

If Xfinity tech hasn't been out to test gateway and signal at the tap may be worthwhile to schedule a visit. While the charge may seem excessive its worth it to find out if the issue is on Xfinity side or in customer's home or owned equipment.

 Also on the bright side if the issue is found to be on Comcast side there should be no charge for the visit. As for the description of the issue, if the signal was stable to device when connected by ethernet directly to the modem then the issue is probably not signal related. The type of router isn't mentioned but it may be worthwhile to try switch and see if there is any improvement. If by router you're referring to WIFI device, than it may be worthwhile to see if switching to wired ethernet connections to other device on the network improves things. WIFI is convenience but there are number of issues that impact QOS to other device downstream.

 Just my .2 cents.

 Thanks and good luck.

@Gervin33 

The signal stats were good at that snapshot in time. Are there any modem error log entries being shown ? If so, please post them as well in their entirety (copy and paste them, don't post a screenshot) but redact the CM MAC and the CMTS MAC addresses for your privacy. They are considered to be personal information. Personally identifying information is a violation of their forum guidelines. The forum bot will not allow your post to be seen publically.

Here are the modem events for today.  I think the ones from 7am PST are from when I rebooted the modem this morning.  I can watch for more events going forward as well.

As someone mentioned above, I was on a wired connection last night and was again receiving disconnect messages.  I am using a Netgate SG-3100 router.

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) / 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 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 !

I keep getting a bunch of errors and disconnects, is there any update?  Here are some more modem entries I have been getting:

I had a similar problem as described here. I turned off "Private Wi-Fi Address" on my iPhone, which was enabled by default, and that seemed to fix the issue. The problem seemed to be my computer would completely disconnect from the network then reconnect, as if it had been waiting for a DHCP reassignment. I think the DHCP address space was getting full from the changing MAC address on my iPhone, and when the DHCP address space would overflow, this would cause a 10 second disconnection to occur.