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CM2050V goes offline every few weeks - how to troubleshoot
My Netgear Nighthawk CM2050V cable modem, purchased earlier this year, linked to Comcast service has been going offline every few weeks for the past two months. Comcast cannot find an issue. Powerin...
Thank you for taking the time to provide a detailed response. The Duckware link was particularly helpful.
I would appreciate your opinion on where the problem lies - hardware, ISP, software, other? I do not want to buy a new cable modem to find out it does not solve the problem
Before posting to this site, I contacted Comcast. They performed tests from the host side and said the connection looked good. A serviceman came out and said the connection looked good at the modem and suggested replacing the CM2050V with another one. I have looked through the modem logs and see a couple of critical errors that happen every now but they do not seem to be interfering with the modem - despite the errors I have not experienced any problem and the modem has stayed online.
I have attached a "Cable Info" report from this morning. Do you see issues that I should contact Comcast about? As far as I can tell, other than the critical errors (maybe benign), everything looks great (following the troubleshooting in the Duckware article).
As I purchased this modem earlier this year, I cannot get Netgear support without buying a contract.
Again, thank you for your advice.
Still seeing some Warnings in the logs. Something the ISP should look into. Otherwise, looks ok.
What FW is on the modem.
Just FYI on what some others are seeing:
Might ask about this from your ISP.
Hello FURRYe38,
Again, thank you for your helpful comments. Your help and patience has paid off as there appears to be a resolution in sight based on an email from Comcast I received today (see below). You asked for the firmware version on my modem. It is V2.01.03.
A minor question. Previously I was able to generate a "Cable Information" report from the web interface. Now I cannot find the link to do that. Do you know where it is? The report (see attachment to post in this thread on Nov. 26, 2023 at 16:31) is a great comprehensive dump of diagnostic information.
What I heard from Comcast today follow. In summary: Netgear software issue.
We've noticed intermittent connectivity issues with your internet service and have identified the cause to be a defect with your NETGEAR CM2050V internet modem. NETGEAR is working on a software update that should fix the problem. Because the update may not be available for several months, we have taken steps in the interim to stabilize your connection and provide you with the best possible experience. These proactive measures should resolve your intermittent connectivity issues and provide you with fast speeds, but your modem may not achieve the full upstream speeds included in your Xfinity Internet package until the NETGEAR CM2050V software update is deployed.
I assume there are a number of Comcast/Xfinity customers who are having a similar issue. Hopefully, they will find this resolution before going out and purchasing a new modem as I was advised by Comcast technician. Fortunately, your advice saved me from making that expensive mistake.
Best wishes