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Connectivity Issues

Frequent Visitor

Connectivity Issues

Hi:  since replacing my Comcast supplied modem with my own (NetGear AC1600), I have had internet dropping issues and severe loss of speed on both wired and wi-fi connections.  It often seems triggered when I connect my cell phone to the wi-fi network - not sure if this is just coincidence.  I have spoken with both Netgear and Comcast and both say everything is 'fine on their end'.  Please help, it is making me crazy!

 
 
Time Priority Description
2019-7-9, 11:11:36 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 11:11:35 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 11:10:11 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 11:10:06 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 11:08:37 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 11:08:37 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 10:57:23 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 10:57:23 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 10:51:30 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 10:51:29 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 10:51:29 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 10:51:29 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 10:38:57 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 10:38:57 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 10:32:13 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-8, 18:37:21 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-8, 18:09:26 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-8, 18:09:26 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-8, 14:01:06 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-8, 13:54:09 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-8, 13:52:11 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-8, 13:52:11 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-8, 13:49:19 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;

 

 

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 21 579000000 Hz 3.1 dBmV 40.2 dB 28 38
2 Locked QAM256 25 603000000 Hz 2.7 dBmV 40 dB 45 18
3 Locked QAM256 26 609000000 Hz 2.6 dBmV 39.9 dB 65 0
4 Locked QAM256 27 615000000 Hz 2.7 dBmV 39.9 dB 62 2
5 Locked QAM256 28 621000000 Hz 2.1 dBmV 39.7 dB 42 25
6 Locked QAM256 13 531000000 Hz 2.8 dBmV 40.2 dB 36 30
7 Locked QAM256 14 537000000 Hz 2.8 dBmV 40.2 dB 34 32
8 Locked QAM256 15 543000000 Hz 3 dBmV 40.2 dB 42 24
9 Locked QAM256 16 549000000 Hz 2.8 dBmV 40.2 dB 60 5
10 Locked QAM256 17 555000000 Hz 3 dBmV 40.2 dB 56 9
11 Locked QAM256 18 561000000 Hz 2.8 dBmV 40.1 dB 8 58
12 Locked QAM256 19 567000000 Hz 2.8 dBmV 40.1 dB 12 57
13 Locked QAM256 20 573000000 Hz 3.2 dBmV 40.2 dB 22 45
14 Locked QAM256 22 585000000 Hz 3.2 dBmV 40.2 dB 11 56
15 Locked QAM256 23 591000000 Hz 2.6 dBmV 40 dB 10 58
16 Locked QAM256 24 597000000 Hz 2.5 dBmV 40 dB 28 46
 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 6 5120 Ksym/sec 30100000 Hz 38.6 dBmV
2 Locked ATDMA 5 5120 Ksym/sec 36500000 Hz 38.4 dBmV
3 Locked ATDMA 7 5120 Ksym/sec 23700000 Hz 38.8 dBmV
4 Locked ATDMA 8 5120 Ksym/sec 17300000 Hz 38.8 dBmV
Expert

Re: Connectivity Issues

What make model cable modem are you using ? 

 

For a test, does a computer hardwired directly to the cable modem (no router in the mix) have the same problem ?



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Frequent Visitor

Re: Connectivity Issues

I am usine a Netgear AC1600 Cable Modem Router.  I will try a direct connection to it and let you know how it goes...Thanks!

Expert

Re: Connectivity Issues

Oh, o/k. It's that one, sorry.



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Frequent Visitor

Re: Connectivity Issues

Hi:  I plugged a laptop directly into the router and while using my cell phone, the internet service to all devices (both wired and wireless) went down.  Internet was also unavailable on the laptop that was plugged directly in.  It may sound strange but if I do not use my cell phone, the service seems to be a bit more stable...maybe just coincidence?!?  Here is recent log when it went down:

 

2019-7-9, 14:45:52 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 14:45:52 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 14:45:51 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 14:45:51 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
2019-7-9, 14:45:51 Warning (5) MDD message timeout;CM-MAC=28:80:88:be:fe:08;CMTS-MAC=dc:eb:94:b5:bd:cd;CM-QOS=1.1;CM-VER=3.0;
Official Employee

Re: Connectivity Issues

Hello, tpez. Thanks so much for reaching out to us about these connection issues you are having. You're situation definitely seems a bit strange and I'd love to take a closer look to see what can be done to get you back to a consistently stable connection. Please send me a private message with your first and last name so I can assist. 

 

 To send a private message, click my name "ComcastTambrey", then click "send a message".


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