CM2050V instability after firmware upgrade

Forgot to include that I was told my "levels" were good but seeing correctable and uncorrectable errors as mentioned above.

I'm quite sure that I disconnected everything but a direct connection to the modem and computer directly to the modem with similar results, but will once again go through the process.

My bigger concern is losing a second modem to a failed update OR a sudden removal from the approved list AFTER my purchase and forced to the RENTAL modem option.

I'm ultimately a decent customer, paying for a speed tier and settling for "good enough" speed, as opposed to the tier I'm subscribed to, rather than continually go through this to end back at the same place.

I'm running a Nighthawk CM2050V modem which was on 2.01.03 to start. My internet speed package is 1200/40.

2.01.03 I got up to 1400/40 and it worked well (for 2 1/2 years)

9.01.01 I did get 1400/40 and it also worked pretty well.

Since Xfinity rolled back to 2.01.03 I get a littler slower speed but the download test is slow to build the full speed.

I own Netgear Nighthawk CM2050V. Everything worked fine and I have been getting consistent download speeds of 930+ since I last checked on December 21. Today, December 24, things were funky so I rebooted my modem and router - as always, I ran a speed test - It was only 25 down - quite a loss from my "normal" speeds!! I rebooted over and over without improvement. Thinking that perhaps my router (Asus RT-AX88U) could be the problem, I attached my desktop directly to the modem and still had the extremely slow speeds. I did the Comcast troubleshooter, and it found no problems. I finally got through to an actual person, Michelle, who was puzzled about the loss of speed. During the time on the phone, I googled and found a lot of information on the Netgear site that described my experience perfectly - others are having the same problem. I concluded that the firmware was likely the issue and then I came upon some notes I took when I was having event log warnings (RNG-RSP CCAP Commanded Power in Excess of 6db Below the value corresponding to the top of DRW...) in October and the firmware was V9.01.0 - it is now V2.01.03. Clearly there has been a firmware "update" from Comcast recently. Now the modem is almost unusable.

What can I do? I would appreciate any help or advice anyone can give me. Thank you so much.

Merry Christmas.

Kathy

I suppose I should throw my hat into the ring as well. I have a CM2050V, but downstream of that is a Unifi Dream Machine Pro which in part is used to analyze my overall network connectivity. In the UDM Pro's GUI, there is a visualization of the last 24 hours of internet connectivity, which is a colored bar showing status. Ideally this would be all green. However, I have a mostly green bar with interspersed yellow spots, which indicate high latency (or possibly subtle connection loss), and one or two brief red spots, indicating a complete loss of connectivity. It is quite intermittent as there is no visible pattern in the frequency or duration of the events. If I can see this data on my side, there is no excuse that Comcast wouldn't know about it on their end. It would seem that the new firmware is simply unstable and not ready for release yet, but was pushed out anyway.

Comcast trying to pass the buck off to Netgear if they are the ones who have pushed firmware to users' devices without prior warning is unacceptable. What is equally unacceptable is the way that Comcast's idea of damage control is to double down on the claims, redirect users in an open forum to a 1:1 with their notoriously inadequate customer service, censor legitimate criticism, offer to replace the malfunctioning equipment with a stock modem that will incur additional rental fees, and insist on wasting everyone's time (several months to fix a bug??) rather than simply doing the easy thing as others have mentioned: roll back the firmware. Why this is beyond the comprehension of one of the largest ISPs in the US is ridiculous.

There is a reason why I purchased this modem to begin with. It is because I do not trust Comcast. I do not trust that a standard issue Comcast rental modem router is going to have an acceptable standard of quality and security. That same stock modem router also costs next to nothing for Comcast to manufacture and hand out to paying customers, yet Comcast insists that it is "rental" equipment which comes out to over a hundred dollars in an additional expense over the course of less than a year. Sorry, but I refuse to "own nothing and be happy" as the saying goes.

I was also under the impression that since I purchased my own modem, that Comcast would not insist on remotely updating the firmware on MY DEVICE without prior notification. Had nothing bad occurred due to the sheer lack of incompetence on display, I never would have noticed. My firmware was running just fine without the meddling. I'm inclined to trust Netgear's word over Comcast's on this particular issue as well, simply because of Comcast's track record of keeping their word. It's bad enough to have an arbitrary 1TB data cap imposed on me several years ago (which Comcast was fined for by the FCC for failing to notify customers in advance).

The most unfortunate part in all of this is that Comcast has done everything in their power to stamp out competition, and increase prices on their products and services without much to show for it. Comcast catches enough bad PR over their poor customer service that one would think the wise move would be reinvesting that money back into their company, instead of outsourcing to call centers in India with people who can barely speak English just to exploit the lower or nonexistent minimum wage. It's entirely possible however that their dominance in the market removes any incentive to actually improve their services. It will not get better either since startup competitors tend to be immediately bought out or smothered in frivolous lawsuits. I wonder who would do that?

I would be very disappointed (but not surprised) to see parts of this censored for being """"inflammatory"""". I suppose it would be inflammatory for the very sensitive people at Comcast who do not like their customers discussing any of the myriad concerns about even the bare minimum expectations based on the amount of money that we all pay each month. My bill is well into the hundreds for not even being a business class connection. It's not so much a choice either since Comcast is the de facto best provider in my area. Which itself is a back handed compliment.

I tried to upgrade from an Arris SB8200 to the Netgear CM2050v, and after ordering one, trying to activate it, returning it and getting a replacement, and not being able to activate it.  I had two different techs out, who escalated it to a visit from a higher tier tech.  We spent 4 hours with Xfinity trying to get it activated.  Was told at the end of all of this that the CM2050v really isn't compatible, even though it is one of the only 2 third party modems approved by xfinity for use with my tier plan.  It is sad that they allow it to remain on the approved list.  The other option tops out at 900 mbps, and isn't an option. 

I just updated my drivers for my Ethernet controller and tweaked the advanced settings.

Since this I no longer have a lag when I check the Internet speed using Ookla App in Windows 11.

Could also be less traffic since today is a holiday.

I'm back over 1400/40 yea!

@user_kal 

I thought I was seeing lower speeds after the rollback but after a little more testing I think it's actually just speedtest.xfinity.com not working quite optimally or something else in Comcast's network and not on my line.  The Area IV, IL (Chicago area) speed test server seems to be a little slow, meaning it gets beat by speedtest.net and Google speed test.

Here's what I just got on a 1200/35 plan with a CM2050V.  I've been seeing results like this the last few weeks:

Xfinity:  1282.2/39.8

Speedtest.net:  1436.39/41.99

Google: 1438.2/42.00

As many others have indicated in this forum thread, the Netgear CM2050V (on the list of Xfinity compatible modems for my service tier) firmware update pushed out by Comcast/Xfinity, has turned out to be an epic fail. I find myself having to reboot my modem, or re-sign into my network in order to restore streaming service on my LG OLED smart tv at least 6-10 times a day! I already went through the suggested solution of contacting Xfinity support, having my signal and modem checked, having a service technician come out and confirm signal and speeds are all good. But still the problem persists. Quite frankly I’m really done dealing with Xfinity/Comcast’s so-called customer service!!! While this modem continues to be displayed on the recommended modem list, it is clearly not compatible any longer thanks to Xfinity/Comcast recent firmware push. I specifically purchased this expensive modem as it was the only one that offered voice to support my full services. I didn’t want to have to pay Xfinity to rent their modem as I feel the $215/month I already pay them is enough … it’s the principle of the thing you see. As if that isn’t enough, I received an email yesterday from Xfinity informing me they have upped my speeds yet again and I should now purchase a newer modem to keep up with the full capabilities of my service. They suggest I either do that, or reduce my plan speeds. I’ve been left with few options. According to Xfinity I can continue to suffer constant connectivity issues with my CM2050V modem while I wait for netgear to fix the problem that Xfinity/Comcast introduced, which, they inform me could take several months - no firm projected date. Or, second option, purchase yet another new modem and toss my $300 CM2050V modem in the trash, no guarantees that three months from now that one will continue to be compatible since Xfinity doesn’t take any responsibility for 3rd Party devices. Or, third option, rent an Xfinity Gateway from them. Seems rather self serving to me. I’ve been a loyal customer since 2012, and this is how I’m treated. Anyone want to bet on what kind of response I receive from Xfinity after this? I bet it will start off with a “sincere” apology, followed by directions to click on the chat icon in the upper right corner (which incidentally does not appear in the upper right corner on my iphone for whatever reason) and initiate the same process all over again. The definition of insanity- to continue to do the same thing over and over again while expecting a different outcome. Almost reminds me of Groundhog Day, except Bill Murray eventually got it right!

It seems like Comcast should really tell us when we can expect the firmware and upload speeds to be fixed.  I bought the CM2050V modem because it is on the approved "list," yet our upload speeds are the same.  If we know when to expect the fix and firmware upgrade, then we can decide whether to get a different modem.

Unfortunately, I relied on their "list."

CM2050V is still on the list and is marked "recommended for 10g" so what's the next excuse? 

I would like to know if the issues with the cm2050v were ever resolved.   After the mass mailing I have seen nothing else.  I was told by an agent this morning that the issue has been resolved.  Don't think so