Received Response to Broadcast Maintenance Request But no Unicast Maintenance opportunities received

Hello, I'm experiencing internet connectivity issues identical to those described in this post: https://forums.xfinity.com/t5/Your-Home-Network/Received-Response-to-Broadcast-Maintenance-Request-But-no/td-p/3375716

My symptoms include intermittent lapses in connection (my coworkers have reported significant stalls/lag on my end during video calls, even though I'm using a wired connection), frequent drops in download speed (well below 50% of the speed I'm paying for) and periodically glacial upload speeds (< 1Mbps). On average these lapses in service occur 2-3 times each day & don't seem to be correlated with internet usage by others in the house. My modem's logs lead me to believe that I'm facing the same issue experienced by @uwinmaine in October 2020 (see post linked above):

Time	Priority	Description
2021-2-6, 20:45:40	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:45:08	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:44:20	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:43:48	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:43:01	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:42:28	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:41:41	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:41:08	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:40:21	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:39:48	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:39:01	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:38:28	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:37:41	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:37:09	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:36:21	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:35:49	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:35:01	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:34:29	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:33:42	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:33:10	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:32:22	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:31:49	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:31:02	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:30:29	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:29:42	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:29:09	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:28:22	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:27:49	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:26:42	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:26:10	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:25:02	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:24:30	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:23:22	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:22:50	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:21:43	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:21:10	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:20:23	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:19:50	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:18:43	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:18:10	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;

My modem is a Netgear CM500 & as far as I can tell it's on the latest firmware version available to me: V1.01.14

Here's is some more information that seemed to help resolve the issue in the post linked above:

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	13	531000000 Hz	9.2 dBmV	41.3 dB	1	0
2	Locked	QAM256	1	453000000 Hz	10.2 dBmV	42.8 dB	1	0
3	Locked	QAM256	14	537000000 Hz	8 dBmV	40.4 dB	4	0
4	Locked	QAM256	15	543000000 Hz	7.5 dBmV	40.4 dB	4	0
5	Locked	QAM256	16	549000000 Hz	7.2 dBmV	40.2 dB	2	0
6	Locked	QAM256	2	459000000 Hz	10.9 dBmV	42.8 dB	1990	11029
7	Locked	QAM256	3	465000000 Hz	10.8 dBmV	43 dB	0	0
8	Locked	QAM256	4	471000000 Hz	10.5 dBmV	42.5 dB	0	0
9	Locked	QAM256	5	477000000 Hz	10.5 dBmV	42.6 dB	1	0
10	Locked	QAM256	6	483000000 Hz	10.6 dBmV	41.8 dB	1	0
11	Locked	QAM256	7	489000000 Hz	10.4 dBmV	42.3 dB	1	0
12	Locked	QAM256	8	495000000 Hz	10 dBmV	42 dB	0	0
13	Locked	QAM256	9	507000000 Hz	8.9 dBmV	40.1 dB	2	0
14	Locked	QAM256	10	513000000 Hz	8.9 dBmV	41 dB	0	0
15	Locked	QAM256	11	519000000 Hz	9.4 dBmV	41.3 dB	3	0
16	Locked	QAM256	12	525000000 Hz	9.7 dBmV	41.3 dB	1	0

Upstream Bonded Channels (Partial Service)

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	6	5120 Ksym/sec	30100000 Hz	48.9 dBmV
2	Locked	ATDMA	5	5120 Ksym/sec	36500000 Hz	50.5 dBmV
3	Locked	ATDMA	7	5120 Ksym/sec	23700000 Hz	54 dBmV
4	Not Locked	Unknown	8	0 Ksym/sec	17300000 Hz	0.0 dBmV

I've been experiencing these lapses in service for several months now & no amount of hardware resets / software updates have seemed to improve anything.

In the post linked above, @EG and @ComcastMorgan seemed to understand the situation better than I currently do & it looks like they both helped to resolve the issue for @uwinmaine -- can anyone help me understand what might be going on with my modem + whether or not anything can be done to improve my internet service?

Thanks in advance

(Original post, once more: https://forums.xfinity.com/t5/Your-Home-Network/Received-Response-to-Broadcast-Maintenance-Request-But-no/td-p/3375716#)

Your Home Network

a-t-w

Received Response to Broadcast Maintenance Request But no Unicast Maintenance opportunities received

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