Network dropping sporadically, T3/T4 modem errors

Question

I'm having issues with my new Netgear CM600 modem (coupled with a Eero router - both have been bought in the last 6 months as I'm trying to resolve this issue). Several times a day my upload speed will drop to zero - my video conference calls will sound fine to me, but the folks I'm talking to complain that I'm breaking up so badley that they can't understand what I'm saying. Less frequently, download will drop entirely as well for ~5mins. Looking into my modem logs I see errors corresponding to the connectivity loss. I've had a tech out in the last month and he replaced the line into my house, and my modem is placed as upstream as it can be, with no splitters in the path.

Below I've posted my channel info and the event log from the most recent outage. I greatly appreciate any help that can be offered.

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	621000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enable	BPI+
IP Provisioning Mode	Honor MDD	IPv6 only

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	29	621000000 Hz	10.2 dBmV	37.7 dB	918315	728927
2	Locked	QAM256	41	693000000 Hz	11.5 dBmV	38.0 dB	1195217	1005645
3	Locked	QAM256	42	699000000 Hz	11.5 dBmV	37.9 dB	1134424	967278
4	Locked	QAM256	43	705000000 Hz	11.4 dBmV	37.7 dB	1077725	909350
5	Locked	QAM256	44	711000000 Hz	11.2 dBmV	37.7 dB	1049234	937814
6	Locked	QAM256	25	597000000 Hz	10.2 dBmV	38.2 dB	1014380	895387
7	Locked	QAM256	26	603000000 Hz	10.4 dBmV	38.2 dB	997568	859735
8	Locked	QAM256	27	609000000 Hz	10.7 dBmV	38.2 dB	987441	867534
9	Locked	QAM256	28	615000000 Hz	10.4 dBmV	38.0 dB	955853	830754
10	Locked	QAM256	30	627000000 Hz	10.2 dBmV	37.8 dB	948553	590737
11	Locked	QAM256	31	633000000 Hz	10.8 dBmV	38.0 dB	959874	567346
12	Locked	QAM256	32	639000000 Hz	10.6 dBmV	37.8 dB	973733	641602
13	Locked	QAM256	33	645000000 Hz	10.8 dBmV	37.9 dB	964403	717460
14	Locked	QAM256	34	651000000 Hz	11.3 dBmV	37.9 dB	885084	732896
15	Locked	QAM256	35	657000000 Hz	11.3 dBmV	37.9 dB	840544	704375
16	Locked	QAM256	36	663000000 Hz	11.5 dBmV	38.0 dB	777993	605079
17	Locked	QAM256	37	669000000 Hz	11.3 dBmV	38.6 dB	136	0
18	Locked	QAM256	38	675000000 Hz	11.7 dBmV	38.6 dB	84	26
19	Locked	QAM256	39	681000000 Hz	11.8 dBmV	38.6 dB	61	0
20	Locked	QAM256	40	687000000 Hz	11.6 dBmV	38.7 dB	59	0
21	Locked	QAM256	21	573000000 Hz	9.9 dBmV	38.6 dB	23	0
22	Locked	QAM256	22	579000000 Hz	10.0 dBmV	39.0 dB	0	0
23	Locked	QAM256	23	585000000 Hz	10.2 dBmV	39.1 dB	0	0
24	Locked	QAM256	24	591000000 Hz	10.2 dBmV	39.1 dB	18	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	9	5120 Ksym/sec	35600000 Hz	39.5 dBmV
2	Locked	ATDMA	10	5120 Ksym/sec	29200000 Hz	38.8 dBmV
3	Locked	ATDMA	11	5120 Ksym/sec	22800000 Hz	39.0 dBmV
4	Locked	ATDMA	12	5120 Ksym/sec	16400000 Hz	38.8 dBmV
5	Locked	ATDMA	13	1280 Ksym/sec	39600000 Hz	37.5 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

Event log:

Time	Priority	Description
2020-09-20, 20:35:47	Warning (5)	Dynamic Range Window violation
2020-09-20, 16:35:42	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-20, 16:34:37	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-20, 16:34:26	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-20, 13:34:29	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-20, 13:33:24	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-20, 11:42:15	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-20, 11:42:00	Warning (5)	Dynamic Range Window violation
2020-09-17, 17:37:42	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 17:05:05	Warning (5)	Dynamic Range Window violation
2020-09-17, 16:28:17	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 15:51:12	Warning (5)	Dynamic Range Window violation
2020-09-17, 14:35:00	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 14:34:46	Warning (5)	Dynamic Range Window violation
2020-09-17, 13:15:03	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 13:13:26	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 13:13:10	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 13:04:10	Warning (5)	Dynamic Range Window violation
2020-09-17, 12:46:51	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 12:45:46	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 12:44:25	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 12:42:47	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 12:42:31	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 12:18:18	Warning (5)	Dynamic Range Window violation
2020-09-17, 12:14:31	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 12:12:54	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 12:11:49	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 12:11:15	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 12:10:10	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 12:09:35	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 12:08:30	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 11:46:38	Warning (5)	Dynamic Range Window violation
2020-09-17, 10:25:25	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 10:24:20	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-17, 05:13:14	Warning (5)	Dynamic Range Window violation
2020-09-16, 23:27:28	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-16, 14:27:35	Warning (5)	Dynamic Range Window violation
2020-09-16, 12:28:24	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=38:94:ed:75:39:30;CMTS-MAC=00:56:2b:77:61:ce;CM-QOS=1.1;CM-VER=3.0;
2020-09-16, 00:50:18	Warning (5)	Dynamic Range Window violation
2020-09-16, 00:32:12	Notice (6)	Honoring MDD; IP provisioning mode = IPv6

Your Home Network

aaron5103

Network dropping sporadically, T3/T4 modem errors

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