My Motorola mb8611 kept rebooting frequently as mentioned in other posts I found in this forum.
I guess it may be related to firmware update, because a few times I logged into 192.168.100.1, I noticed a different firmware version.
The device seemed coming with firmware version 8611-19.2.18. And sometime after a rebooting, it became 8611-21.3.7. Then it would reboot again soon and rolling back to 8611-19.2.18.
How could I get stable connection without changing to a new devices?
Also post the signal status below.
Downstream Bonded Channels |
 |
|
 |
|
Channel |
Lock Status |
Modulation |
Channel ID |
Freq. (MHz) |
Pwr (dBmV) |
SNR (dB) |
Corrected |
Uncorrected |
1 |
Locked |
QAM256 |
20 |
507.0 |
-1.6 |
40.8 |
0 |
0 |
2 |
Locked |
QAM256 |
4 |
405.0 |
-1.5 |
41.2 |
0 |
0 |
3 |
Locked |
QAM256 |
5 |
411.0 |
-1.3 |
41.5 |
0 |
0 |
4 |
Locked |
QAM256 |
6 |
417.0 |
-1.3 |
41.5 |
0 |
0 |
5 |
Locked |
QAM256 |
7 |
423.0 |
-1.2 |
41.5 |
0 |
0 |
6 |
Locked |
QAM256 |
8 |
429.0 |
-1.3 |
41.7 |
0 |
0 |
7 |
Locked |
QAM256 |
9 |
435.0 |
-1.3 |
41.7 |
0 |
0 |
8 |
Locked |
QAM256 |
10 |
441.0 |
-1.4 |
41.8 |
0 |
0 |
9 |
Locked |
QAM256 |
11 |
447.0 |
-1.1 |
41.9 |
0 |
0 |
10 |
Locked |
QAM256 |
12 |
453.0 |
-1.0 |
41.9 |
0 |
0 |
11 |
Locked |
QAM256 |
13 |
459.0 |
-1.3 |
41.7 |
0 |
0 |
12 |
Locked |
QAM256 |
14 |
465.0 |
-1.5 |
41.8 |
0 |
0 |
13 |
Locked |
QAM256 |
15 |
471.0 |
-1.4 |
41.6 |
0 |
0 |
14 |
Locked |
QAM256 |
16 |
477.0 |
-1.2 |
42.0 |
0 |
0 |
15 |
Locked |
QAM256 |
17 |
483.0 |
-1.2 |
41.9 |
0 |
0 |
16 |
Locked |
QAM256 |
18 |
489.0 |
-1.2 |
41.8 |
0 |
0 |
17 |
Locked |
QAM256 |
19 |
495.0 |
-1.6 |
41.5 |
0 |
0 |
18 |
Locked |
QAM256 |
21 |
513.0 |
-1.4 |
41.3 |
0 |
0 |
19 |
Locked |
QAM256 |
22 |
519.0 |
-1.3 |
41.8 |
0 |
0 |
20 |
Locked |
QAM256 |
23 |
525.0 |
-1.4 |
41.6 |
0 |
0 |
21 |
Locked |
QAM256 |
24 |
531.0 |
-1.5 |
41.6 |
0 |
0 |
22 |
Locked |
QAM256 |
25 |
543.0 |
-1.6 |
41.4 |
0 |
0 |
23 |
Locked |
QAM256 |
26 |
549.0 |
-1.5 |
41.6 |
0 |
0 |
24 |
Locked |
QAM256 |
27 |
555.0 |
-1.2 |
41.7 |
0 |
0 |
25 |
Locked |
QAM256 |
28 |
561.0 |
-1.1 |
41.7 |
0 |
0 |
26 |
Locked |
QAM256 |
29 |
567.0 |
-1.1 |
41.7 |
0 |
0 |
27 |
Locked |
QAM256 |
30 |
573.0 |
-1.3 |
41.8 |
0 |
0 |
28 |
Locked |
QAM256 |
31 |
579.0 |
-1.3 |
41.8 |
0 |
0 |
29 |
Locked |
QAM256 |
32 |
585.0 |
-1.2 |
41.7 |
0 |
0 |
30 |
Locked |
QAM256 |
33 |
591.0 |
-1.0 |
41.8 |
0 |
0 |
31 |
Locked |
QAM256 |
34 |
597.0 |
-1.0 |
41.9 |
0 |
0 |
32 |
Locked |
OFDM PLC |
48 |
688.0 |
-0.9 |
41.7 |
43877307 |
0 |
|
Upstream Bonded Channels |
 |
|
 |
|
Channel |
Lock Status |
Channel Type |
Channel ID |
Symb. Rate (Ksym/sec) |
Freq. (MHz) |
Pwr (dBmV) |
1 |
Locked |
SC-QAM |
1 |
2560 |
10.4 |
45.0 |
2 |
Locked |
SC-QAM |
2 |
5120 |
16.4 |
42.5 |
3 |
Locked |
SC-QAM |
3 |
5120 |
22.8 |
41.8 |
4 |
Locked |
SC-QAM |
4 |
5120 |
29.2 |
41.3 |
5 |
Locked |
SC-QAM |
5 |
5120 |
35.6 |
41.8 |
6 |
Locked |
SC-QAM |
11 |
2560 |
40.4 |
44.5 |
|
Event log showed the following critical messages:
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;
No Ranging Response received - T3 time-out;
user_20c833
Visitor
•
1 Message
2 years ago
How do I check my firmware?
1
0
nbelk4004
Visitor
•
9 Messages
2 years ago
Same issues using MB8611. Downgraded to a Netgear Docsis 3.0 router while Xfinity figures this out.
3
0
pembroke-ma
Visitor
•
5 Messages
2 years ago
Joining the club of Motorola MB8611 owners - brand new within the past 30 days - that drops the Internet randomly at least 4 to 8 times a day. The only solution is to rent the modem from Xfinity; happy to purchase another modem if that will solve the problem, but it doesn't appear to be very likely they will solve the problem that appears to be caused by Xfinity themselves.
2
user_a8ab8b
Visitor
•
1 Message
2 years ago
I am also having problems with my Motorola 8611 modem, also starting around the same time about a month ago now. currently my modem shows firmware 19.2.18. It routinely restarts itself and drops connection. I had a tech out a couple weeks ago and he fixed my power levels that were "out of spec" It seemed to fix the problem, but it has returned. I am now outside of the return period for this modem, so would love to find a solution.
6
0
martelli
Regular Visitor
•
8 Messages
2 years ago
Just to add on I found this thread because my MB8611 Modem all of the sudden over last 1-2 months has been having intermittent reboot issues which occur at random times with no apparent cause. As others have stated I am fearful when on work video/conference calls through my internet and have had to have a voice dial in as backup given the history. It really is disappointing that Xfinity is not able to address the issues with all the similar user problems noted to offer up solutions. Hopefully this will be resolved in some manner, but I am fearful we will just continue to get the same runaround.
0
petmitsu
Contributor
•
64 Messages
2 years ago
Wow! Is problem still ongoing?? Absolutely ridiculous! I bought an MB8611 modem the first week of December and it never really seemed to work right from the start. The blue downstream arrow never stayed solid and was always blinking. Then I started to get constant disconnects and reboots. I thought it was a connection issue so lots of back and forth chats with comcast and no fix. Then on xmas eve, after yet another chat with troubleshooting the issue, my modem got bricked, probably due to something they sent to it. All lights were on and strobing rapidly. Reset did nothing. Unplugging did nothing. Bricked. So I returned it was going to get another MB8611 but good thing it was out of stock or I would still be in the same boat with you guys. I got an Arris SB8200 and haven't had any issue since. A month later and this problem is still not fixed? Total [Edited: Language] from comcast. And it seems they don't want to acknowledge there's a problem as they'll be admitting fault and then be on the hook for crediting all these people with constant disconnects.
(edited)
2
user_c5a14f
Visitor
•
3 Messages
2 years ago
I too been having the same problem with my 8611. Yesterday it reset 10+ times throughout the day/night. Xfinity has been NO help! I have been searching and found MANY listings for this exact problem. I got so fed up I purchased a Arris Surfboard S33 modem...NO MORE PROBLEMS!! So far running for 6 hours not a glitch. There are NO errors in the event log...only letting me know of successful login.
UPDATE 3 days later: S33 still working flawlessly. No errors, no resetting, no problems. S33 Event log shows no errors unlike the 8611. 8611 going back for warranty repair/replacement.
(edited)
8
user_be3ca5
Contributor
•
11 Messages
2 years ago
Hello All,
I am still having the same exact issue everyone else is having. This has been going on since early December. I am at a loss and I don't feel xfinity is doing anything about it. Clearly this is a firmware compatibility issue between xfinity and Motorola. This modem is "approved" by Comcast so to have to go through this and have 10+ disconnects during work hours is unacceptable. And NO I don't want to buy another modem that may or may not fix the problem. Everyone in this thread already paid for the 8611 and we really just want it to work without disconnecting all day long. I am tired of saying this over and over.
1
Sanuraa
Visitor
•
1 Message
2 years ago
Hey there, just want to say i'm also having the same issue with the 21.3.7 firmware update. Seems the 1m+ errors are switching channels. Used to just be channel 20 and is now erroring out on different ones, but at least not multiple. Also somehow only getting 4 upstream channels when my modem supports 8.
0
sigs
Contributor
•
28 Messages
2 years ago
I spoke with Motorola last Thursday (Tuesday today), and they were to send me a replacement to arrive within 3 days. Now, 3 business days and 5 days later it seems the replacement still has not shipped. I saw on Amazon I could order an Arris S33 and it would arrive this afternoon. My 8611 continues to reset multiple times a day and I have 2 virtual job interviews set to occur in the next 48 hours (4 resets during my virtual job interview in 45 minutes last week with the 8611). I pulled the trigger on the Arris, should arrive in a few hours. I have asked Motorola to keep the replacement and asked for reimbursement for the 8611 that does not function properly under its 2-year warranty. We'll see how this all plays out.
7
0
user_8936c5
Visitor
•
14 Messages
2 years ago
I'm on eight disconnects today. 2 of them in 3 minutes........
0
0
motok.rc
Visitor
•
1 Message
2 years ago
Well, add me to the list! I've been using my modem for 2+ years without a single problem until recently. I've had 2 disconnects today. Started having this issue early December, and it hasn't stopped yet.
Does anyone have any updates on the matter? This is extremely frustrating.
Currently running below version on my MB8611:
1
0
user_8936c5
Visitor
•
14 Messages
2 years ago
1
user_8936c5
Visitor
•
14 Messages
2 years ago
0
user_8936c5
Visitor
•
14 Messages
2 years ago
0