Just recently switched cable modems from the MB8611 to the CM3000 for higher upload speeds. The upload speeds have improved to 300Mbps but the download speeds seem capped at 600-800 on our 1100Mbps plan. I'm wondering if something on the Comcast side isn't configured quite right because this modem s

I need a real solution, not generic troubleshooting steps. I recently upgraded from a 300 Mbps plan to an 800 Mbps plan. During checkout, Xfinity required me to upgrade my modem, so I purchased and activated a Motorola MB8611, which was one of the modems listed as officially supported. Since activ

Hello. Would someone with the ability to improve the signal quality to my residence please respond to this thread. Lately, I have been experiencing a large amount of uncorrected errors on my modem which has been in service less than four years; model Motorola MB8611. Yesterday a Level 2 Repair Tech

I have a Motorola MB8611, and have been at this address for 2 years (I bought the modem new when we moved in). This last year I noticed a few times when the internet would drop out, but not enough to investigate. In the last month, it started dropping out more and more. After some investigation with

Can anyone tell me what's going on with this high corrected/uncorrected count? I've had techs out and one said it's the line from the house to the box and another just said, "replace the modem".  Downstream Bonded Channels  

I am using the rented SB6121, which is EOL for the Internet service I have. I own a MB7420 whose faster speed matches my Internet speed. Can I just substitute my 7420 for Xfinity's 6121?

Hello, Here is a timeline of events for this issue: August 2023: Xfinity service starts at my apartment with an MB8611 modem (which was approved as a third-party modem on Xfinity's list). It runs flawlessly for a year until the week of 8/25/2024. 8/25/2024: My speeds drop to single digits 8/31/2

Hi. I purchased a MB8611 modem. Pulling up the software page it seems clear event though it's supposed to be a docsis 3.1 modem, it isn't. Could this be updated? Cable Specification Version DOCSIS 3.0      Hardware Version V1.0  &n

Hi all, I've been following the discussions here among others who purchased the Motorola MB8611, I too am having problems that multiply whenever the modem installs the 21.3.7 firmware. I'm an IT infrastructure architect, not primarily specialized in networking but it's part of what I do. Many of m

I have a Motorola MB8611 modem which is on the Xfinity Approved 3rd party list. 3 or 4 times per day, the modem disconnects from the Internet. This usually happens on the quarter past the hour or half past the hour. (+- approx one minute) I have a script running to monitor CONNECTION ACQUIRED con

I recently put in service my own Motorola MB8611 which is on the list of approved modems for my plan. As soon as I connected it and checked the connectino speed on a wired desktop I showed a maximum of 720Mbps Down and 5.71Mbps up. On the previous day I got 900Mbps down / 240Mbps up on the Xfinity

I had been having issues with the dreaded MB8611 modem for over two months without anything ever being fixed. Connection dropping constantly.  Motorola suggested I add a return path 12 dB attentuator because my upstream dbmv values were at 31/32.  Now, those levels are at 44-45 dB, which

I had a tech out, and he was, with his "magic box" able to get 2100 MBS down, and 400 MBS up from my S33 modem. I am taking this signal with a Cat 6 cable to a TP-Link | BE9300 Tri-Band Wi-Fi 7 Router. I am hooking up to a 2.5 MBS port on the router to my PC, directly with ethernet. My D/L is still

I have been having flaky internet since I moved to a new address and started using MB8611 Modem. I live in a cull de sac, all my neighbors do not have flaky internet at the same time my internet is down. I have tried restart, restart once every 2 days etc but it does not seem to work.I looked at the

I have an MB8611, along with an Asus Mesh Network with three RT-AX88U Wireless Routers, scattered across the house. I work from home and have recently experienced connection drops at least 1-2 times per day. Pretty sure it's the modem, as the last time it happened I logged into the modem and saw t

First, let me preface by saying there is at least a half dozen other threads on this form with this exact same issue with this exact same modem. I have taken all of the steps in those forum posts that were recommended. For example, I have alleviated any splitter, I also took out the 40 dB attenuatio

Hi, I've had two techs out to my house recently because I rarely (if ever) get close to the speed I'm supposed to. The first tech said there's a signal issue outside my home and he would call for a bucket truck to work on the line, but one never showed. I contacted support again who sent another te

Hi there, Our configuration:  Xfinity 1200 Plan Modem: Motorola MB8611 Router: Eero 6e Is it possible to install NordVPN directly on the modem so that our entire network is secure? We have a lot of smart home devices connected, and several Apple devices.  Thanks!

This is [Edited: "Language"] with this drop connection especially if you have no other alternative option. Something needs to be done about this [Edited: "Solicitation"]. Had a net gear router modem combo that worked great and one day they outdated it and it wouldn't work anymore. [Edited: "Languag

Since I moved into this apartment in December 2020, I've been having nothing but headaches with Xfinity download speed At my previous location I used to have 100 Mbps, and with my older NetGear CM500 was able to get 140-150 Mbps But here, at new location, once my plan was updated to 400 Mbps/s I ba