Visitor
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5 Messages
MB8611 Problems
I have been having frequent disconnects with my MB8611. I have tried everything I can to get this thing to work on Xfinity. It disconnects anywhere from two to ten times a day. Had this at a previous house and removed everything between me and feed from the utility pole, no success. I assumed it was the old feed coming down a long dead end road. I have recently moved to a brand new home with a new service with nothing between the MB8611 and the feed coming from the Xfinity box and the problem persists. I got my hands on an old SB6121 and hooked it up for the past 24+ hours I have had no disconnects which doesn't happen with the MB8611. I would say that this is something definitively wrong with the MB8611. I have read that others have had similar issues with the MB8611. Anyone got advice besides scrap the MB8611?
petmitsu
Contributor
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64 Messages
2 years ago
If you want to torture yourself, keep the MB8611 and keep tolerating the disconnects and wait and hope for Comcast to fix the issue or get another brand of modem, not a Motorola, and get your life back. Avoid the Arris SB6190 modem too.
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XfinityVianney
Official Employee
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1.7K Messages
2 years ago
Hi, @steelesh8114. Thank you for creating a new post to help spark some discussion around your MB8611. Recently, I've noticed more and more post coming in regarding this specific device. They all typically report exactly same issues you did here. Mainly, its constant disconnects (T3 timeouts) while online. I've had customers contact the manufacturer directly, replace cables/hardware, and even have a tech out. In the end, I see most decide to replace the modem with another Xfinity Approved device or move to our Xfinity Gateway. It could certainly help if you could post your event logs here, so we can all take a look and compare. Have you already given them a look? If so, any red flags?
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Jlavaseur
Problem Solver
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948 Messages
2 years ago
@steelesh8114 I use the mb8611 on Comcast with flawless performance, so it does work here…
(edited)
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Jlavaseur
Problem Solver
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948 Messages
2 years ago
I don’t think there is a secret, but I will tell you this, I was using the new Xb8 for a trial run, performed as expected, anyway I hooked up my mb8611 I had been using, it booted up, all the lights were normal, I thought great I am online, I tried a webpage and got the page that said I had to activate my modem, I thought ok even tho the lights showed I was online, I looked at my routers configuration page and was surprised to see it had a public ip address, very odd, so dropped into a shell and pinged google, I got a response, I was clearly online to some degree, I did a few more commands I definitely online, so not thinking to explore this more I called up tech support to activate my modem, he tells me he can’t see my modem, yet I was clearly online to some degree, I got the usual tighten my connection, do I have a splitter, I was just on the Xb8 with no issues minutes earlier, so he has me reboot the mb8611, then he goes, I see it now but it’s not activated, yet some how I was online to some degree, he activates it and says ok your good, the lights were exactly the same, I don’t know, but I could use webpages now, so to me that was very odd, I probably could of gotten some free internet since they couldn’t see my modem connected to their network, anyway with the problems with the mb8611 on Comcast I decided to call Motorola, mind you not to complain but possibly share some information they may or may not know, so me and extremely knowledgeable rep had better then a hours conversation, we shared a lot information but he was careful not to say anything privileged etc, but I could read between the lines to a certain extent, anyway I an not convinced that it’s just the modems fault, I feel there could possibly be another issue/problem that isn’t being explored, mind you it’s my theory, anyway if you look on the cox Internet forums, folks with the same modem are echoing almost verbatim the same concerns, I find that very odd also, Is the modem actually rebooting/loosening connection? Or just possibly your devices?
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Jlavaseur
Problem Solver
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948 Messages
2 years ago
@steelesh8114 I can login to the mb8611 admin page with my iPad, anyway for a test did you try to reboot the modem with nothing attached to it to rule out the router and anything attached to it…
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cajual
Visitor
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3 Messages
2 years ago
return it and get an s33
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emattheis
Visitor
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17 Messages
2 years ago
Is s33 confirmed stable? I really don't want to replace a perfectly good modem just because of a network/firmware problem, but if that's what it takes to get back to stability I may have to. What's to stop this issue from cropping up with with the s33?
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steelesh8114
Visitor
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5 Messages
2 years ago
I just hooked up a new CM1000. It has been running with no issues for 24+ hours. The issue is the MB8611. It does not work.
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Jlavaseur
Problem Solver
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948 Messages
2 years ago
@steelesh8114 well my mb8611 works perfectly, after some research, I am curious where folks have their modems, my is in a room with the temperature under 50 degrees, I am curious if the modems are rebooting because of high cpu temperatures…
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cajual
Visitor
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3 Messages
2 years ago
I finally gave in and switched to an Arris S33 and it’s flawless. No restarts for 3 days now. Motorola still says it’s an ISP issue. I tried THREE MB8611 modems with the same issue on each. Coming from a CM1150 which was flawless, this experience has left me never wanting to purchase a Motorola product again.
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GUS_GuyUsingSystem
Visitor
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44 Messages
2 years ago
Hmmm - I am new here & are also wary that the MB8611 is the culprit.
I have been getting intermittent drop outs more frequently the last month also.
1 tech has come out but couldn't find anything & he is calling another for next week.
I would bet that it's a configuration issue between the Motorola & the Comcast network guys & not a faulty MB8611.
(edited)
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user_8936c5
Visitor
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14 Messages
2 years ago
Every time Xfinity forces software update 21.3.7 the modem will disconnect every 1 hr, until the modem reverts back to software version 19.2.20 . When the Modem is on software version 19.2.20 it has zero disconnects..... Stop Forcing 21.3.7 until you figure this out. Thank you
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Oregon_Trail
Visitor
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1 Message
2 years ago
Is there a way to lock the firmware at 19.2.20? Or is Comcast just going to run it over with the faulty 21.3.7 firmware.
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user_99f29b
Visitor
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4 Messages
2 years ago
Just raising my hand as another user who couldn't stand the constant disconnects with MB9611 and had to replace it. I'm now using a NETGEAR Nighthawk Cable Modem CM1200 and it's working very well - no interruptions!
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user_94482a
Visitor
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1 Message
2 years ago
I bought a MB8611 modem and a Nighthawk RAX30 router last June, upgrade my service speed. it worked fine until the Christmas time. I have been suffering the frequent disconnects and trying to understand what the problem is. MB8611 keeps rebooting by itself.
an Xfinity technician came to my home, he tested MB8611 with his equipment, the modem didn't reboot. when he tested MB8611 along with Nighthawk router, he sees frequent reboot. He told me it might be the firmware update on my router cause the issue. I tried to rollback the older version firmware on my router, problem continues, no improvement.
How do I determine it's the modem issue or router issue? If I go for overpriced CM2000, will it be solid? I bought MB8611 just a little bit 6 months ago, xfinity representative recommended the brand and model, because I initially bought an arris, I suffered so much had to return it. Is it possible to find the performance list anywhere on xfinity website for all the supported modems?
any suggestion?
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