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Why does modem disconnects from CMTS occasionally






Roommate was in the middle of an Overwatch Competitive game, I was in the middle of WoW derping around and suddenly the net goes out. I hop onto the router (Netgear R6100) and the modem (Netgear CM400), both owned by me, to check what happened. The router indicated it had no DHCP IP ( The modem indicated that no DBC Acknowledgement was received and it appears that it started scanning for signal soon after that? Does anyone know the likely cause of this to happen in the middle of the day?


Modem Event Log:


*** Entries before this were several days earlier. ***

Aug 18 16:12:50 2018 Error (4) DBC-ACK not received

Aug 18 16:12:54 2018 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out

Aug 18 16:13:42 2018 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out

Aug 18 16:14:23 2018 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1


ISP: Spectrum (formerly serviced by Time Warner Cable)


Startup Procedure


Acquire Downstream Channel537000000 HzLocked

Connectivity StateOkOperational

Boot State----

Configuration File----


IP Provisioning ModeIPv6 Onlyipv6Only(1)

Downstream Bonded Channels

ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUnCorrectables

1LockedQAM 2569537000000 Hz11.9 dBmV38.2 dB1502

2LockedQAM 25610543000000 Hz12.0 dBmV38.2 dB0521

3LockedQAM 25611549000000 Hz11.8 dBmV38.2 dB01417

4LockedQAM 25612555000000 Hz11.9 dBmV37.9 dB01510

5LockedQAM 25613561000000 Hz11.3 dBmV38.2 dB25606

6LockedQAM 25614567000000 Hz11.1 dBmV38.2 dB15718

7LockedQAM 25615573000000 Hz11.6 dBmV38.2 dB451475

8LockedQAM 25616579000000 Hz11.7 dBmV38.2 dB141632

Upstream Bonded Channels

ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower

1LockedTDMA652560 Ksym/sec19200000 Hz48.0 dBmV

2LockedATDMA665120 Ksym/sec24000000 Hz48.8 dBmV

3LockedATDMA675120 Ksym/sec30400000 Hz49.5 dBmV

4LockedATDMA685120 Ksym/sec36800000 Hz50.5 dBmV

Current System Time: Sat Aug 18 16:56:49 2018

Edited by Squirrelington
Added ISP.
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That should be the fault or your ISP's line, not the router/modem. Call up your ISP and get someone to look at your line.

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