I signed up just to put my voice into this.
I've been experiencing the same problem for about 2 weeks as well.
I have a Netgear Nighthawk CM2000, and my downstream is only locking one of the 2 channels.
Initially I was having dropped packets (Ping timeouts) about 5 or 6 consecutive pings dropped per hour, which were bad enough to know me off a Teams/Zoom meeting. A tech came over, and saw nothing on their pings. He did replace all the Coax terminations on all endpoints, and they even ran ping-plotter to my neighborhood, and didn't see anything. So they, of course, blamed it on my modem, being faulty, etc...
Of course, on my end, I can't update firmware or do anything on it as firmware is pushed from their side. Magically, my ping drops stopped occurring. (That mostly proves that my modem was not at fault, but something on their side that got addressed)
Fast-forward about one week, my download speed degraded down to about 28-30 Mbps (I am on a 2.5Gbps / 100Mbps) connection.
I opened a ticket with support, and they started giving me a bunch of ridiculous suggestions to fix this, like "Update your OS", and "your Antivirus may be out of date". (I kid you not, I have the chat)
I should mention, the tests I did were disconnected from my Orbi Mesh network, and connected directly to my laptop via an Ethernet cable, and receiving a public IP directly on my laptop. (So NATing)
After a modem reboot, I can do about 2 or 3 speed tests at 2.2Gbps download speed, and then a few minutes later, it immediately drops back down to 28-30Mbps. (sometimes even down to the teens)
I am willing to admit that my modem could be the culprit at this point, but it is literally the last "device" between me and Cox, and I am willing to buy another one and try it out, to rule out the modem being the problem, even though I am not convinced that it is, given that the issue with the ping request timeouts resolved itself without me touching the modem. But if I need to escalate the issue, I want to be able to say that I've literally replaced every piece of equipment on my end.
I just really really don't want to have to replace the modem with their Panoramic Modem/Router/WiFi , because I have additional devices on my network that I need to be connected, and also want to be able to use my Orbi system.
Does anyone have any recommendations on modems that work better than the CM2000? I would appreciate any insight anyone might have regarding this. I am at a loss, and I have no better alternatives for internet in my area. Hate being held hostage by a monopoly!
p.s: I don't know about you, but the rep I was chatting with refused to give me a ticket reference number, but instead gave me a phone number to call, to start the process all over again. He also refused to have a manager call me after I requested it. They also don't allow you to save your chat transcript after a chat. This should tell you something about accountability and obfuscation of their communications to disarm the customer from building a case. What a joke of a company.
