Internet Dropping Frequently

Question

Good Afternoon,

Appreciate any help I can get on this. My wife and I have been working from home since February and we’d notice the internet would drop every once in a while for a few minutes, maybe once a week. The last few weeks have been challenging with the internet dropping out several times a day. I'm not seeing any Correct/Uncorrected on my Downstream. I’ve run speed tests when this is happening and it appears as if our upload speed is dropping to 0Mbps, while our download speeds remain above 100Mbps. Our modem is a MB8600 and we have the cable running straight to it from the box outside, no splitters. Spoke with my neighbors and they are having the same issue it seems. Spoke with Comcast and they basically said they'll call to schedule a tech to come out, but that there was no ETA on when they were going to resume house calls in my area.

Startup Sequence
Startup Step	Status	Comment
Acquire Downstream Channel	579000000 Hz	Locked
Upstream Connection	OK	Operational
Boot State	OK	Operational
Configuration File	OK
Security	Enabled	BPI+

Downstream Bonded Channels
Channel	Lock Status	Modulation	Channel ID	Freq. (MHz)	Pwr (dBmV)	SNR (dB)	Corrected	Uncorrected
1	Locked	QAM256	25	579	5.7	40.9	0	0
2	Locked	QAM256	9	483	4.5	41.2	0	0
3	Locked	QAM256	10	489	5	41.5	0	0
4	Locked	QAM256	11	495	4.9	41.5	0	0
5	Locked	QAM256	12	501	5.1	41.4	0	0
6	Locked	QAM256	13	507	5.5	41.6	0	0
7	Locked	QAM256	14	513	5.6	41.6	0	0
8	Locked	QAM256	15	519	5.5	41.5	0	0
9	Locked	QAM256	16	525	5.6	41.6	0	0
10	Locked	QAM256	17	531	5.5	41.5	0	0
11	Locked	QAM256	18	537	5.5	41.4	0	0
12	Locked	QAM256	19	543	5.4	41.4	0	0
13	Locked	QAM256	20	549	5.3	41.4	0	0
14	Locked	QAM256	21	555	5.5	41.3	0	0
15	Locked	QAM256	22	561	5.6	41.2	0	0
16	Locked	QAM256	23	567	5.4	41	0	0
17	Locked	QAM256	24	573	5.5	41	0	0
18	Locked	QAM256	26	585	5.9	40.9	0	0
19	Locked	QAM256	27	591	5.9	40.9	0	0
20	Locked	QAM256	28	597	6.1	40.9	0	0
21	Locked	QAM256	29	603	6	40.8	0	0
22	Locked	QAM256	30	609	5.7	40.6	0	0
23	Locked	QAM256	31	615	5.6	40.3	0	0
24	Locked	QAM256	32	621	5.4	40.4	0	0
25	Locked	QAM256	33	627	5.5	40.3	0	0
26	Locked	QAM256	34	633	5.2	40.1	0	0
27	Locked	QAM256	35	639	5	40.1	0	0
28	Locked	QAM256	36	645	4.7	39.8	0	0
29	Locked	QAM256	37	651	4.6	39.9	0	0
30	Locked	QAM256	38	657	4.4	40	0	0
31	Locked	QAM256	39	663	4.3	39.7	0	0
32	Locked	QAM256	40	669	3.8	39.4	0	0
33	Locked	OFDM PLC	159	690	4.1	37.8	3454265	0

Upstream Bonded Channels
Channel	Lock Status	Channel Type	Channel ID	Symb. Rate (Ksym/sec)	Freq. (MHz)	Pwr (dBmV)
1	Not Locked	SC-QAM	1	5120	35.6	45.5
2	Locked	SC-QAM	2	5120	29.2	44.8
3	Locked	SC-QAM	3	5120	22.8	45.8
4	Locked	SC-QAM	4	5120	16.4	46.3

Time	Priority	Description
Mon Sep 21 2020 13:25:14	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:25:28	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:25:31	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:25:44	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:28:14	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:28:44	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:30:14	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:30:44	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:30:44	Notice (6)	CM-STATUS message sent. Event Type Code: 6; Chan ID: 1; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:30:47	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:31:07	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:31:37	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:31:38	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:32:08	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:32:25	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:32:55	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:32:56	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:33:00	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:33:30	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:33:44	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:33:48	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:34:18	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:35:53	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:36:23	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:36:40	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:37:10	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:37:11	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:37:41	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:37:58	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:38:28	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:38:29	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 21 2020 13:38:59	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4e:b3:78;CMTS-MAC=00:c8:8b:d7:e3:24;CM-QOS=1.1;CM-VER=3.1;

dan105 · Answer

Anyone got any suggestions? Thanks.

MachinaEstDeus · Answer

I've been having frequent disconnects for 2 weeks now. 2 tech visits. No change. Disconnects are more frequent in the morning and 9 to midnight.

This morning I pulled all the stuff they added to my incoming line and added a 6dB forward path attenuator. Been a lot more at stable. I need to get a 2nd one. I don't know what else to do when Comcast employees don't know how to fix an issue.

dan105 · Answer

Thanks, that might be my next step. I've already replaced my mb8600 with an sb6190 and things seemed to work fine for about 5 days, then back to dropping. I ran a new rg6 from the box on my house to the modem yesterday and that didn't help either. Supposed to have a tech out tomorrow morning, we'll see how that goes.

hyubie · Answer

It looks to be a relatively common problem - this is the third post I saw about this. I posted on https://forums.xfinity.com/t5/Your-Home-Network/Internet-dropping-numerous-times-per-day/m-p/3373990/highlight/false#M334843

and it looks like this one had the same problem: https://forums.xfinity.com/t5/Your-Home-Network/Xfinity-100-Mbps-connection-keeps-dropping-intermittent/m-p/3340034#

I am having the same problem. I don't know how to get my modem's log, but I installed a google chrome plugin to detect my internet connection while I am working, and this is just this morning:

Online for 0:02:07

Disconnects in 24h: 50

Total disconnects: 1005

Date and time Status

09/29/2020 10:19:00 AM	Online
09/29/2020 10:18:32 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 10:18:18 AM	Online
09/29/2020 10:17:56 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 10:16:21 AM	Online
09/29/2020 10:16:20 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 10:11:18 AM	Online
09/29/2020 10:11:17 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 10:11:08 AM	Online
09/29/2020 10:11:02 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 10:10:54 AM	No internet connection
09/29/2020 10:10:23 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:56:55 AM	Online
09/29/2020 9:56:47 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:56:33 AM	Online
09/29/2020 9:56:30 AM	No internet connection
09/29/2020 9:55:59 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:47:45 AM	Online
09/29/2020 9:47:44 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:45:49 AM	Online
09/29/2020 9:45:23 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:41:42 AM	Online
09/29/2020 9:41:41 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:41:21 AM	Online
09/29/2020 9:40:59 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:40:05 AM	Online
09/29/2020 9:39:41 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:37:24 AM	Online
09/29/2020 9:37:23 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:36:37 AM	Online
09/29/2020 9:35:17 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:31:36 AM	Online
09/29/2020 9:31:29 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:31:27 AM	No internet connection
09/29/2020 9:30:53 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:26:59 AM	Online
09/29/2020 9:26:59 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:26:50 AM	Online
09/29/2020 9:26:35 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:22:02 AM	Online
09/29/2020 9:21:59 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:04:58 AM	Online
09/29/2020 9:04:58 AM	No internet connection
09/29/2020 9:04:29 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 9:04:26 AM	No internet connection
09/29/2020 9:04:02 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 8:54:21 AM	Online
09/29/2020 8:53:20 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 8:51:01 AM	Online
09/29/2020 8:50:47 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 8:44:28 AM	Online
09/29/2020 8:44:02 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 8:43:54 AM	Online
09/29/2020 8:43:29 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 8:42:24 AM	Online
09/29/2020 8:41:56 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 8:41:29 AM	Online
09/29/2020 8:41:26 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 8:38:36 AM	Online
09/29/2020 8:38:17 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 8:38:02 AM	Online
09/29/2020 8:37:47 AM	No internet connection. Wi-Fi/Ethernet OK
09/29/2020 8:29:04 AM	Online
09/29/2020 8:29:02 AM	No internet connection. Wi-Fi/Ethernet OK

Basically confirms what I thought - it's not my WiFi, it's the connection itself.

Your Home Network

dan105

Internet Dropping Frequently

Responses

dan105

MachinaEstDeus

dan105

hyubie

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