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Intermittent Internet Disconnects

js1933
Regular Visitor

Intermittent Internet Disconnects

Hello! I have an issue where my Cable Modem repeatedly loses connection. This happens many times throughout the day. Looking at the Xfinity App on my iPhone, it will repeatedly say "NETGEAR CM1000 disconnected" and show me offline, only for a moment, then it will reconnect.

 

The wiring into my house is 1 coax feed into the basement, which is connected to a Male-Male Coax Connector, and is then connected to the coax cable which goes directly upstairs and plugs into my Cable Modem, a new Netgear CM1000v2. From there, it's connected to a new router, TP LINK A10. All coax runs in the house were done by comcast. I experienced this behavior on my old equipment, so I bought the new modem and router, but that has not changed the behavior. Signal levels and event log are below. Comcast came out once, and said the levels at the street looked good. I didn't let them inside because this was during the worst of the COVID-19 outbreak.

 

<tabindex=-1>Startup Procedure</tabindex=-1>
ProcedureStatusComment
Acquire Downstream Channel519000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeHonor MDDIPv6 only

<tabindex=-1>Downstream Bonded Channels</tabindex=-1>
ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1LockedQAM25613519000000 Hz7.2 dBmV42.1 dB75013522400
2LockedQAM25610501000000 Hz7.2 dBmV42.0 dB75013986400
3LockedQAM25611507000000 Hz7.3 dBmV42.0 dB75014871600
4LockedQAM25612513000000 Hz7.5 dBmV42.2 dB75015285200
5LockedQAM25614525000000 Hz7.4 dBmV42.2 dB75015659000
6LockedQAM25615531000000 Hz7.0 dBmV42.1 dB75016036700
7LockedQAM25616537000000 Hz7.1 dBmV42.1 dB75016407200
8LockedQAM25617543000000 Hz6.9 dBmV42.0 dB75016797400
9LockedQAM25618549000000 Hz6.7 dBmV41.8 dB75017339500
10LockedQAM25619561000000 Hz6.6 dBmV41.9 dB75017686900
11LockedQAM25620567000000 Hz6.7 dBmV41.9 dB75018142500
12LockedQAM25621573000000 Hz6.4 dBmV41.7 dB75018438300
13LockedQAM25622579000000 Hz6.8 dBmV42.0 dB75017117700
14LockedQAM25623585000000 Hz6.5 dBmV41.7 dB75017133800
15LockedQAM25624591000000 Hz6.6 dBmV41.9 dB75017281600
16LockedQAM25626597000000 Hz6.8 dBmV41.9 dB75016516200
17LockedQAM25627603000000 Hz6.6 dBmV41.8 dB75017428900
18LockedQAM25628609000000 Hz6.5 dBmV41.9 dB75017784800
19LockedQAM25629615000000 Hz6.3 dBmV41.5 dB75018218500
20LockedQAM25630621000000 Hz6.3 dBmV41.7 dB75018533800
21LockedQAM25631627000000 Hz6.2 dBmV41.6 dB75018987000
22LockedQAM25632633000000 Hz6.2 dBmV41.6 dB75019354800
23LockedQAM25633639000000 Hz6.0 dBmV41.5 dB75019775900
24LockedQAM25634645000000 Hz6.0 dBmV41.5 dB75020128000
25LockedQAM25635651000000 Hz6.3 dBmV41.6 dB75020525800
26LockedQAM25636657000000 Hz6.0 dBmV41.5 dB75020861500
27LockedQAM25637663000000 Hz6.3 dBmV41.6 dB75021268500
28LockedQAM25638669000000 Hz6.1 dBmV41.4 dB75021623200
29LockedQAM25639675000000 Hz6.2 dBmV41.1 dB75021865800
30LockedQAM25640681000000 Hz5.9 dBmV41.3 dB75022173100
31LockedQAM25641687000000 Hz6.0 dBmV41.2 dB75022450700
32Not LockedUnknown00 Hz0.0 dBmV0.0 dB000

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
ChannelLock StatusModulationChannel IDFrequencyPower
1LockedATDMA2936500000 Hz41.3 dBmV
2LockedATDMA3030100000 Hz42.3 dBmV
3LockedATDMA3123700000 Hz41.8 dBmV
4LockedATDMA3217300000 Hz42.3 dBmV
5Not LockedUnknown00 Hz0.0 dBmV
6Not LockedUnknown00 Hz0.0 dBmV
7Not LockedUnknown00 Hz0.0 dBmV
8Not LockedUnknown00 Hz0.0 dBmV

<tabindex=-1>Downstream OFDM Channels</tabindex=-1>
ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1Locked0, 1, 2, 325693000000 Hz6.3 dBmV39.8 dB1108 ~ 2987198123354161469780520
2Not Locked000 Hz11.0 dBmV0.0 dB0 ~ 4095000

<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>
ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
1Not LockedUnknown00 Hz0 dBmV
2Not LockedUnknown00 Hz0 dBmV

Current System Time: Sat Jan 23 15:23:40 2021
System Up Time: 4:36:04

 

2021-01-23, 11:24:40Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:75:00;CMTS-MAC=00:01:5c:62:8a:55;CM-QOS=1.1;CM-VER=3.1;
2021-01-23, 10:48:30Critical (3)SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=9c:c9:eb:87:75:00;CMTS-MAC=00:01:5c:62:8a:55;CM-QOS=1.1;CM-VER=3.1;
2021-01-23, 10:48:30Notice (6)DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=9c:c9:eb:87:75:00;CMTS-MAC=00:01:5c:62:8a:55;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedNotice (6)Honoring MDD; IP provisioning mode = IPv6
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:75:00;CMTS-MAC=00:01:5c:62:8a:55;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:75:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2021-01-23, 10:40:05Critical (3)SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=9c:c9:eb:87:75:00;CMTS-MAC=00:01:5c:62:8a:55;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:75:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:75:00;CMTS-MAC=00:01:5c:62:8a:55;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:75:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2021-01-23, 01:18:54Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:75:00;CMTS-MAC=00:01:5c:62:8a:55;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:75:00;CMTS-MAC=00:01:5c:62:8a:55;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:75:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;