After upgrading to Xtreme+, I am getting daily WAN disconnects that are somewhat mystifying.
When the problem occurs, some WebSocket connections are still maintained. Specifically,
1. Device freezes on website traffic for all devices connected, whether they are ethernet or WiFi
2. Existing video/audio streams continue, even after router is locked up. So it's not a full stop on traffic, just traffic on new requests.
3. Cannot add new devices to router
Modem/Router combo is a Netgear Nighthawk X4S; it's not overheating. I did a factory reset 3 weeks ago; firmware is latest from Xfinity/Comcast (V3.01.43). Using a variety of devices running iOS, MacOS, Android, and Windows; all experience the same issue.
I checked my signal strength and the values seem to be fine.
| Downstream Bonded Channels |
| Channel |
Lock Status |
Modulation |
Channel ID |
Frequency |
Power |
SNR |
Correctables |
Uncorrectabables |
| 1 |
Locked |
QAM256 |
20 |
531000000 Hz |
1.4 dBmV |
41.9 dB |
4 |
0 |
| 2 |
Locked |
QAM256 |
17 |
513000000 Hz |
2.5 dBmV |
42.4 dB |
1 |
0 |
| 3 |
Locked |
QAM256 |
18 |
519000000 Hz |
2.3 dBmV |
42.1 dB |
4 |
0 |
| 4 |
Locked |
QAM256 |
19 |
525000000 Hz |
1.9 dBmV |
42.1 dB |
2 |
0 |
| 5 |
Locked |
QAM256 |
21 |
537000000 Hz |
1.0 dBmV |
41.6 dB |
13 |
0 |
| 6 |
Locked |
QAM256 |
22 |
543000000 Hz |
0.7 dBmV |
41.6 dB |
4 |
0 |
| 7 |
Locked |
QAM256 |
23 |
549000000 Hz |
0.3 dBmV |
41.6 dB |
6 |
0 |
| 8 |
Locked |
QAM256 |
24 |
555000000 Hz |
0.1 dBmV |
41.2 dB |
11 |
0 |
| 9 |
Locked |
QAM256 |
25 |
561000000 Hz |
-0.2 dBmV |
41.2 dB |
20 |
0 |
| 10 |
Locked |
QAM256 |
26 |
567000000 Hz |
-0.3 dBmV |
41.0 dB |
13 |
0 |
| 11 |
Locked |
QAM256 |
27 |
573000000 Hz |
0.0 dBmV |
41.1 dB |
14 |
0 |
| 12 |
Locked |
QAM256 |
28 |
579000000 Hz |
0.1 dBmV |
41.3 dB |
16 |
0 |
| 13 |
Locked |
QAM256 |
29 |
585000000 Hz |
0.2 dBmV |
41.3 dB |
17 |
0 |
| 14 |
Locked |
QAM256 |
30 |
591000000 Hz |
0.0 dBmV |
41.1 dB |
16 |
0 |
| 15 |
Locked |
QAM256 |
31 |
597000000 Hz |
0.4 dBmV |
41.2 dB |
17 |
0 |
| 16 |
Locked |
QAM256 |
32 |
603000000 Hz |
0.6 dBmV |
40.9 dB |
22 |
0 |
| 17 |
Locked |
QAM256 |
33 |
609000000 Hz |
1.1 dBmV |
41.2 dB |
18 |
0 |
| 18 |
Locked |
QAM256 |
34 |
615000000 Hz |
1.6 dBmV |
41.4 dB |
32 |
0 |
| 19 |
Locked |
QAM256 |
35 |
621000000 Hz |
1.8 dBmV |
41.5 dB |
33 |
0 |
| 20 |
Locked |
QAM256 |
36 |
627000000 Hz |
1.7 dBmV |
41.2 dB |
21 |
0 |
| 21 |
Locked |
QAM256 |
37 |
633000000 Hz |
1.3 dBmV |
40.8 dB |
29 |
0 |
| 22 |
Locked |
QAM256 |
38 |
639000000 Hz |
1.1 dBmV |
41.1 dB |
34 |
0 |
| 23 |
Locked |
QAM256 |
39 |
645000000 Hz |
0.9 dBmV |
41.2 dB |
13 |
0 |
| 24 |
Locked |
QAM256 |
40 |
651000000 Hz |
0.4 dBmV |
40.9 dB |
30 |
0 |
| 25 |
Locked |
QAM256 |
41 |
657000000 Hz |
-0.1 dBmV |
40.7 dB |
31 |
0 |
| 26 |
Locked |
QAM256 |
42 |
663000000 Hz |
-0.4 dBmV |
40.6 dB |
41 |
0 |
| 27 |
Locked |
QAM256 |
43 |
669000000 Hz |
-0.2 dBmV |
40.7 dB |
32 |
0 |
| 28 |
Locked |
QAM256 |
44 |
675000000 Hz |
0.3 dBmV |
40.9 dB |
28 |
0 |
| 29 |
Locked |
QAM256 |
45 |
681000000 Hz |
0.8 dBmV |
40.7 dB |
32 |
0 |
| 30 |
Locked |
QAM256 |
46 |
687000000 Hz |
1.7 dBmV |
41.2 dB |
23 |
0 |
| 31 |
Locked |
QAM256 |
47 |
693000000 Hz |
2.7 dBmV |
41.5 dB |
17 |
0 |
| 32 |
Not Locked |
Unknown |
0 |
0 Hz |
0.0 dBmV |
0.0 dB |
0 |
0 |
|
| Upstream Bonded Channels |
| Channel |
Lock Status |
US Channel Type |
Channel ID |
Symbol Rate |
Frequency |
Power |
| 1 |
Locked |
ATDMA |
4 |
5120 Ksym/sec |
36700000 Hz |
39.5 dBmV |
| 2 |
Locked |
ATDMA |
1 |
5120 Ksym/sec |
17300000 Hz |
40.8 dBmV |
| 3 |
Locked |
ATDMA |
2 |
5120 Ksym/sec |
23700000 Hz |
40.3 dBmV |
| 4 |
Locked |
ATDMA |
3 |
5120 Ksym/sec |
30300000 Hz |
40.0 dBmV |
| 5 |
Not Locked |
Unknown |
0 |
0 Ksym/sec |
0 Hz |
0 dBmV |
| 6 |
Not Locked |
Unknown |
0 |
0 Ksym/sec |
0 Hz |
0 dBmV |
| 7 |
Not Locked |
Unknown |
0 |
0 Ksym/sec |
0 Hz |
0 dBmV |
| 8 |
Not Locked |
Unknown |
0 |
0 Ksym/sec |
0 Hz |
0 dBmV |
|
Netgear community suggested that it may be due to a splitter or other signal quality issues. Any advice/help would be appreciated. @ComcastMorgan
Accepted Solution
idolgov
Frequent Visitor
•
9 Messages
5 years ago
Update: Disconnects mysteriously disappeared and have stayed away for ~3 weeks. Hoping it keeps up.
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Armtek
Regular Visitor
•
4 Messages
5 years ago
Can't help you solve the problem but I can confirm that I have the same issue, and maybe provide more insight. . I'm using a Netgear Nighthawk CM1200 modem latest firmware. Sometimes it requires rebooting both the modem and WiFi router, and sometimes it requires doing a reset of the CM1200. Behavior only just started in the past 7 days or so. Here's a copy of the log around the event (my CM-MAC is blanked out with Xs, CMTS-MAC blanked out with Y's,- if the MAC is listed as 00:00:00:00:00:00 then that's the way it shows up)
Mon Jun 22 16:23:11 2020 — Notice (6)
CM-STATUS message sent. Event Type Code: 24; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=YY:YY:YY:YY:YY:YY;CM-QOS=1.1;CM-VER=3.1;
Mon Jun 22 16:22:45 2020 Notice (6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=YY:YY:YY:YY:YY:YY;CM-QOS=1.1;CM-VER=3.1;
Mon Jun 22 16:19:48 2020 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=YY:YY:YY:YY:YY:YY;CM-QOS=1.1;CM-VER=3.1;
Mon Jun 22 16:19:43 2020 Notice (6) TLV-11 - unrecognized OID;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=YY:YY:YY:YY:YY:YY;CM-QOS=1.1;CM-VER=3.1;
Time Not Established — Notice (6)
Honoring MDD; IP provisioning mode = IPv6
Time Not Established — Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established — Warning (5)
Lost MDD Timeout;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established — Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;
CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established — Warning (5)
Lost MDD Timeout;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established — Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
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idolgov
Frequent Visitor
•
9 Messages
5 years ago
Here's my event log... more than 3 weeks of regular disconnects
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0
idolgov
Frequent Visitor
•
9 Messages
5 years ago
Another one today...
Any suggestions from Comcast folks?
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idolgov
Frequent Visitor
•
9 Messages
5 years ago
@ComcastMorgan @ComcastIdris @ComcastJK @ComcastZach @ComcastSeanR .... looking for a friend.
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AdamDonze
New Poster
•
7 Messages
5 years ago
Seems I have a similar/identical issue, despite tier 1 support telling me everything is fine...
https://forums.xfinity.com/t5/Your-Home-Network/Constant-Network-Drops/td-p/3348322
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idolgov
Frequent Visitor
•
9 Messages
5 years ago
Quite frustrating indeed. Looking for a friend, Comast.
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asmith2017
New Poster
•
6 Messages
5 years ago
I'm having the same issues (using Netgear C7000v2, though). T-3, T-4, and MDD timeouts everyday. All support staff has done is ignore me (phone, chat, and social media). I think I'm just going to call AT&T later, and switch services. I've already confirmed that my setup on my side of the drop is in perfect condition.
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asmith2017
New Poster
•
6 Messages
5 years ago
Had another disconnection, and was able to collect my own data, right afterwards:
https://forums.xfinity.com/t5/Your-Home-Network/Intermittent-T-3-T-4-and-MDD-Timeouts-Please-fix-our/td-p/3349988
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RoyPadgett8301
New Poster
•
1 Message
5 years ago
Exactly the same situation for me. I have a CM1200 and started getting drops about 3 weeks ago. I have to reboot the modemabout 3 times per day. Here is my connection status.
Cable Connection
Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency 0
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 507000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enabled BPI+
IP Provisioning Mode Honor MDD honorMdd(4)
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 5 507000000 Hz 4.8 dBmV 41.4 dB 0 0
2 Locked QAM256 1 477000000 Hz 4.9 dBmV 41.7 dB 0 0
3 Locked QAM256 2 483000000 Hz 4.6 dBmV 41.6 dB 0 0
4 Locked QAM256 3 489000000 Hz 4.7 dBmV 41.5 dB 0 0
5 Locked QAM256 4 495000000 Hz 4.7 dBmV 41.3 dB 0 0
6 Locked QAM256 6 513000000 Hz 5 dBmV 41.5 dB 0 0
7 Locked QAM256 7 519000000 Hz 5 dBmV 41.4 dB 0 0
8 Locked QAM256 8 525000000 Hz 5 dBmV 41.4 dB 2 0
9 Locked QAM256 9 531000000 Hz 4.9 dBmV 41.3 dB 0 0
10 Locked QAM256 10 537000000 Hz 4.9 dBmV 41.3 dB 0 0
11 Locked QAM256 11 543000000 Hz 4.6 dBmV 41.1 dB 0 0
12 Locked QAM256 12 549000000 Hz 4.4 dBmV 41 dB 0 0
13 Locked QAM256 13 555000000 Hz 4.7 dBmV 41.1 dB 0 0
14 Locked QAM256 14 561000000 Hz 4.8 dBmV 41.1 dB 0 0
15 Locked QAM256 15 567000000 Hz 4.9 dBmV 41 dB 1 0
16 Locked QAM256 16 573000000 Hz 4.6 dBmV 41 dB 1 0
17 Locked QAM256 17 579000000 Hz 4.9 dBmV 41.1 dB 1 0
18 Locked QAM256 18 585000000 Hz 4.8 dBmV 41.1 dB 2 0
19 Locked QAM256 19 591000000 Hz 4.8 dBmV 41 dB 2 0
20 Locked QAM256 33 453000000 Hz 4.6 dBmV 41.8 dB 1 0
21 Locked QAM256 34 459000000 Hz 4.6 dBmV 41.6 dB 0 0
22 Locked QAM256 35 465000000 Hz 4.7 dBmV 41.5 dB 0 0
23 Locked QAM256 36 471000000 Hz 4.7 dBmV 41.6 dB 0 0
24 Locked QAM256 38 423000000 Hz 4.8 dBmV 42 dB 0 0
25 Locked QAM256 39 435000000 Hz 4.8 dBmV 42 dB 0 0
26 Locked QAM256 40 441000000 Hz 4.5 dBmV 41.9 dB 0 0
27 Locked QAM256 41 447000000 Hz 4.5 dBmV 41.8 dB 0 0
28 Locked QAM256 42 399000000 Hz 4.9 dBmV 42.2 dB 0 0
29 Locked QAM256 43 405000000 Hz 4.9 dBmV 42.2 dB 0 0
30 Locked QAM256 44 411000000 Hz 4.9 dBmV 42.1 dB 0 0
31 Locked QAM256 45 417000000 Hz 4.8 dBmV 42 dB 0 0
32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 1 5120 Ksym/sec 35800000 Hz 48.5 dBmV
2 Locked ATDMA 2 5120 Ksym/sec 29400000 Hz 49.3 dBmV
3 Locked ATDMA 3 5120 Ksym/sec 23000000 Hz 48.5 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 16600000 Hz 48.5 dBmV
5 Locked ATDMA 5 1280 Ksym/sec 39800000 Hz 47.3 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
Downstream OFDM Channels
Channel Lock
Status Modulation /
Profile ID Channel
ID Frequency Power SNR /
MER Active Subcarrier
Number Range Unerrored
Codewords Correctable
Codewords Uncorrectable
Codewords
1 Locked 0 ,1 ,2 ,3 37 690000000 Hz 5.2 dBmV 40.6 dB 1228 ~ 2867 106010121 44940424 0
2 Not Locked 0 0 0 Hz 0 dBmV 0.0 dB 0 ~ 4095 0 0 0
Upstream OFDMA Channels
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV
Extended Upstream Transmit Power
Enable Extended Upstream Transmit Power
Current System Time:Wed Jul 01 15:50:46 2020
System Up Time:03:43:48
0