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Tue, Jan 19, 2021 10:00 AM

Connectivity Issue - intermittent drops. Please help!



I'm running into an issue with my home network where the connection drops randomly and is down for 1-2 minutes then comes back up. I have not been able to resolve this issue unfortunately and it is very frustrating.


Plan: 400 mbps

Downstream speed: 470 mbps

Upstream: 25 mbps


Equipment: CM600, Nest Wifi


In MS Event Viewer, it says something about DHCP renewal lease issue, but I don't know if this is a red herring or not.


Any help is appreciated. When I called tech support they said the CM600 is not rated beyond 250 mbs, but on the product page it in fact says it is rated up to 500 mbps. "Support Cable Internet Service plans up to 300Mbps. Recommended for all speed tiers up to 500 Mbps. Separate router required for WiFi. 24x8 channel bonding"


Modem statistics: 


Apply               Cancel     
Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency

Startup Procedure

Acquire Downstream Channel525000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
IP Provisioning ModeHonor MDDIPv6 only

Downstream Bonded Channels

ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM2569525000000 Hz9.2 dBmV38.7 dB240
2LockedQAM25610531000000 Hz9.0 dBmV38.7 dB210
3LockedQAM25611537000000 Hz8.8 dBmV38.6 dB250
4LockedQAM25612543000000 Hz9.0 dBmV38.7 dB220
5LockedQAM25613555000000 Hz8.8 dBmV38.5 dB280
6LockedQAM25614561000000 Hz9.1 dBmV38.6 dB190
7LockedQAM25615567000000 Hz8.7 dBmV38.5 dB270
8LockedQAM25616573000000 Hz9.1 dBmV38.6 dB300
9LockedQAM25617579000000 Hz8.9 dBmV38.5 dB180
10LockedQAM25618585000000 Hz8.9 dBmV38.4 dB320
11LockedQAM25619591000000 Hz8.4 dBmV38.2 dB380
12LockedQAM25620597000000 Hz8.7 dBmV38.3 dB360
13LockedQAM25621603000000 Hz8.3 dBmV38.2 dB310
14LockedQAM25622609000000 Hz8.7 dBmV38.3 dB270
15LockedQAM25623615000000 Hz8.7 dBmV38.2 dB260
16LockedQAM25624621000000 Hz8.6 dBmV38.0 dB430
17LockedQAM25625627000000 Hz7.8 dBmV38.5 dB00
18LockedQAM25626633000000 Hz7.6 dBmV38.3 dB00
19LockedQAM25627639000000 Hz7.4 dBmV38.3 dB00
20LockedQAM25628645000000 Hz7.0 dBmV38.2 dB00
21LockedQAM25629651000000 Hz7.2 dBmV38.2 dB00
22LockedQAM25631657000000 Hz6.5 dBmV37.8 dB00
23LockedQAM25632663000000 Hz6.6 dBmV37.9 dB00
24LockedQAM25633669000000 Hz6.6 dBmV37.8 dB00

Upstream Bonded Channels

ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA25120 Ksym/sec29200000 Hz30.5 dBmV
2LockedATDMA15120 Ksym/sec35600000 Hz30.8 dBmV
3LockedATDMA35120 Ksym/sec22800000 Hz31.0 dBmV
4LockedATDMA45120 Ksym/sec16400000 Hz30.3 dBmV
5LockedATDMA91280 Ksym/sec39600000 Hz30.3 dBmV
6Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
7Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
8Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV





86.6K Messages

4 m ago

FWIW, Comcast rates the CM600 for up to 959 Mbps;


For a test, does a computer / device hardwired directly to the CM600 cable modem with an ethernet cable have the same problem ?



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21 Messages

4 m ago

It's a good question. I'll try hardwiring the desktop directly to modem, bypassing the router to see if the issue persists. My hunch is it will persist since I doubt it is a router issue. I'll try it out and will reply back here.

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