Ethernet Connection Disconnects (20 seconds at a time) - Various Points In The Day

[Rizqo]

Hello, 

As the title suggests, for the last 3-4 months my ethernet on my desktop PC has been dropping at various points in the day. I suspect it may have something to do with my Hub 5.

Tonight (06/07/2024 @ around 10 pm) I had a couple of disconnects in a row. I may only get 1 disconnect on some days, but on others, I may get 1 - 2 an hour.

I have:

- Replaced the ethernet cable.

- Checked for outages in my area.

- Reseated each cable into the router and tried each individual ethernet port.

- Resetting the router.

Unfortunately, nothing has worked. Here are my downstream, upstream and network logs:

3.0 Downstream channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1	331000000	0.6	41	QAM 256	25
2	195000000	1.6	40	QAM 256	8
3	203000000	1.2	40	QAM 256	9
4	211000000	1.4	41	QAM 256	10
5	219000000	1.4	41	QAM 256	11
6	227000000	0.9	40	QAM 256	12
7	235000000	0.7	40	QAM 256	13
8	243000000	0.4	40	QAM 256	14
9	251000000	0.1	40	QAM 256	15
10	259000000	0.1	40	QAM 256	16
11	267000000	1	41	QAM 256	17
12	275000000	1.6	41	QAM 256	18
13	283000000	1.7	41	QAM 256	19
14	291000000	1.5	41	QAM 256	20
15	299000000	1.5	41	QAM 256	21
16	307000000	1.5	41	QAM 256	22
17	315000000	1.3	41	QAM 256	23
18	323000000	0.9	41	QAM 256	24
19	339000000	0.6	41	QAM 256	26
20	347000000	0.3	41	QAM 256	27
21	355000000	0.1	40	QAM 256	28
22	363000000	0.1	41	QAM 256	29
23	371000000	0.4	40	QAM 256	30
24	379000000	0.9	40	QAM 256	31
25	387000000	-1.1	40	QAM 256	32
26	395000000	-1.1	40	QAM 256	33
27	403000000	0.9	40	QAM 256	34
28	411000000	0.9	40	QAM 256	35
29	419000000	0.8	40	QAM 256	36
30	427000000	0.6	40	QAM 256	37
31	435000000	0.4	40	QAM 256	38

3.0 Downstream channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1	Locked	41	0	0
2	Locked	40	0	0
3	Locked	40	0	0
4	Locked	41	0	0
5	Locked	41	0	0
6	Locked	40	0	0
7	Locked	40	0	0
8	Locked	40	0	0
9	Locked	40	0	0
10	Locked	40	0	0
11	Locked	41	0	0
12	Locked	41	0	0
13	Locked	41	0	0
14	Locked	41	0	0
15	Locked	41	0	0
16	Locked	41	0	0
17	Locked	41	0	0
18	Locked	41	0	0
19	Locked	41	0	0
20	Locked	41	0	0
21	Locked	40	0	0
22	Locked	41	0	0
23	Locked	40	0	0
24	Locked	40	0	0
25	Locked	40	0	0
26	Locked	40	0	0
27	Locked	40	0	0
28	Locked	40	0	0
29	Locked	40	0	0
30	Locked	40	0	0
31	Locked	40	0	0

3.1 Downstream channels

Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)

41

94

4K

1840

QAM 4096

1108

3.1 Downstream channels

Channel ID Locked Status RxMER Data (dB) PLC Power (dBmV) Corrected errors (Active Profile) Uncorrectable errors (Active Profile)

41

Locked

38

-6.3

19119073

0

3.0 Upstream channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

0	49600000	48.5	5120	QAM 64	4
1	43100000	48.5	5120	QAM 64	5
2	36600000	48.8	5120	QAM 64	6
3	30100000	48.5	5120	QAM 64	8
4	23600000	48.3	5120	QAM 64	11

3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

0	ATDMA	0	0	0	0
1	ATDMA	0	0	0	0
2	ATDMA	0	0	0	0
3	ATDMA	0	0	0	0
4	ATDMA	0	0	0	0

3.1 Upstream channels

Channel Channel Width (MHz) Power (dBmV) FFT Type Modulation

12

10.4

44.0

2K

QAM 256

3.1 Upstream channels

Channel Channel Type Number of Active Subcarriers First Active Subcarrier (Hz) T3 Timeouts T4 Timeouts

12

OFDMA

208

74000000

0

Network Log

Time Priority Description

06-07-2024 23:14:31	notice	GUI Login Status - Login Success from LAN interface
06-07-2024 23:10:36	notice	REGISTRATION COMPLETE - Waiting for Operational status
06-07-2024 23:10:32	notice	US profile assignment change. US Chan ID: 12; Previous Profile: 13; New Profile: 11 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 23:10:26	notice	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 23:10:19	warning	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 23:10:16	notice	Honoring MDD; IP provisioning mode = IPv4
06-07-2024 23:10:02	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 23:10:01	critical	Cable Modem Reboot because of - Reboot Timezone Change
06-07-2024 23:07:32	critical	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 23:06:44	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 23:06:23	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 23:06:16	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 23:06:14	critical	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 23:02:13	critical	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 23:01:29	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 23:01:18	critical	Cable Modem Reboot because of - Reboot Factory reset ACS
06-07-2024 23:01:18	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

I also had some network logs prior:

Router status

StatusDownstreamUpstreamConfigurationNetwork Log
Refresh data
Network Log

Time Priority Description
06-07-2024 23:14:31 notice GUI Login Status - Login Success from LAN interface
06-07-2024 22:10:36 notice REGISTRATION COMPLETE - Waiting for Operational status
06-07-2024 22:10:32 notice US profile assignment change. US Chan ID: 12; Previous Profile: 13; New Profile: 11 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 22:10:26 notice DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 22:10:19 warning DHCP WARNING - Non-critical field invalid in response ;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 22:10:16 notice Honoring MDD; IP provisioning mode = IPv4
06-07-2024 22:10:02 critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 22:10:01 critical Cable Modem Reboot because of - Reboot Timezone Change
06-07-2024 22:07:32 critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 22:06:44 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 22:06:23 critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 22:06:16 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 22:06:14 critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 22:02:13 critical Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 22:01:29 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
06-07-2024 22:01:18 critical Cable Modem Reboot because of - Reboot Factory reset ACS
06-07-2024 22:01:18 critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

[Matthew_ML]

Hey Rizqo, thank you for reaching out and a warm welcome to the community I am so sorry to hear about this.

I am going to send you a DM so we can look into this 🙂