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scaevity's avatar
scaevity
Aspirant
May 12, 2023

Nighthawk cax30 dropping internet connectivity almost daily

The first couple months after purchasing the Nighthawk CZX30 router it was working great, but the last couple months it's started having major connectivity issues, sometimes as frequently as several ...
scaevity's avatar
scaevity
Aspirant
May 15, 2023

This is the status right now (when it's working)...

 

Cable Diagnostic
Status: Good
Action: Your setup looks fine. If you are still experience an internet issue, the Netgear Cable Knowledge Base can provide additional troubleshooting info.
Internet Access: (green)
 

 

Downstream Status: (green)
 

 

Upstream Status: (green)
 

 

 
 
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
 
<tabindex=-1>Startup Procedure</tabindex=-1>
ProcedureStatusComment
Acquire Downstream Channel435000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnabledBPI+
IP Provisioning ModeHonor MDDIPv6 only
 
<tabindex=-1>Downstream Bonded Channels</tabindex=-1>
 
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectabables
1Locked256 QAM1435000000 Hz-2.8 dBmV41.8 dB638740
2Locked256 QAM2441000000 Hz-3.1 dBmV41.8 dB631400
3Locked256 QAM3447000000 Hz-2.9 dBmV41.9 dB634680
4Locked256 QAM4453000000 Hz-2.9 dBmV41.8 dB637810
5Locked256 QAM5459000000 Hz-3.4 dBmV41.6 dB645842613
6Locked256 QAM6465000000 Hz-3.0 dBmV41.8 dB64015921
7Locked256 QAM7471000000 Hz-2.8 dBmV41.9 dB61158270
8Locked256 QAM8477000000 Hz-2.4 dBmV42.2 dB592590
9Locked256 QAM9483000000 Hz-2.2 dBmV42.3 dB585990
10Locked256 QAM10489000000 Hz-2.5 dBmV42.3 dB580740
11Locked256 QAM11495000000 Hz-2.5 dBmV42.4 dB581480
12Locked256 QAM12501000000 Hz-2.0 dBmV42.5 dB582340
13Locked256 QAM13507000000 Hz-2.1 dBmV42.5 dB567720
14Locked256 QAM14513000000 Hz-2.1 dBmV42.6 dB564770
15Locked256 QAM15519000000 Hz-1.8 dBmV42.7 dB562510
16Locked256 QAM16525000000 Hz-1.9 dBmV42.8 dB540800
17Locked256 QAM17531000000 Hz-1.8 dBmV43.0 dB521600
18Locked256 QAM18537000000 Hz-1.5 dBmV43.0 dB520880
19Locked256 QAM19543000000 Hz-1.6 dBmV43.0 dB515060
20Locked256 QAM20549000000 Hz-1.1 dBmV43.2 dB512020
21Locked256 QAM21555000000 Hz0.8 dBmV43.0 dB493180
22Locked256 QAM22561000000 Hz0.4 dBmV43.3 dB494200
23Locked256 QAM23567000000 Hz0.5 dBmV43.3 dB485930
24Locked256 QAM24573000000 Hz0.7 dBmV43.2 dB472900
25Locked256 QAM25579000000 Hz0.8 dBmV43.2 dB465580
26Locked256 QAM26585000000 Hz0.5 dBmV43.3 dB457350
27Locked256 QAM27591000000 Hz0.3 dBmV43.1 dB452160
28Locked256 QAM28597000000 Hz0.2 dBmV43.3 dB438580
29Locked256 QAM29603000000 Hz0.3 dBmV43.2 dB432610
30Locked256 QAM30609000000 Hz0.5 dBmV43.2 dB427960
31Locked256 QAM31615000000 Hz0.5 dBmV43.0 dB435540
32Locked256 QAM32621000000 Hz0.2 dBmV42.6 dB429610
 
<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
 
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA25120 Ksym/sec16400000 Hz46.5 dBmV
2LockedATDMA35120 Ksym/sec22800000 Hz46.5 dBmV
3LockedATDMA45120 Ksym/sec29200000 Hz46.0 dBmV
4LockedATDMA55120 Ksym/sec35600000 Hz46.0 dBmV
5LockedATDMA65120 Ksym/sec40400000 Hz46.0 dBmV
6Not LockedUnknown00 Ksym/sec0 Hz0 dBmV
7Not LockedUnknown00 Ksym/sec0 Hz0 dBmV
8Not LockedUnknown00 Ksym/sec0 Hz0 dBmV
 
<tabindex=-1>Downstream OFDM Channels</tabindex=-1>
 
ChannelChannel IDFrequencyPowerSNR/MERActive Subcarrier Number RangeTotal CodewordsUncorrectable Codewords
1159702000000 Hz3.4 dBmV41.7 dB1126 ~ 29698562290750
200 Hz0 dBmV0 dB0 ~ 000
 
<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>
 
ChannelUpstreamIsMutedRanging StatusSubcarrier Zero FrequencyActive Subcarrier Number RangeSymbols Per FrameTx Power
1 Other0 MHz0 ~ 000 dBmV
2 Other0 MHz0 ~ 000 dBmV
 
Extended Upstream Transmit PowerEnable Extended Upstream Transmit Power
 
Current System Time: 2023-05-15 10:58:17
System Up Time: 2Days, 20:38:47
FURRYe38's avatar
FURRYe38
Guru - Experienced User
May 15, 2023

You have a ton of correctables and some un-correctables. Means the modem is going lots of processing to make things work coming in from the ISP side and these should be mostly all zeros. 

 

Power levels or good however seem a bit all over the place. 

 

Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box. 
Be sure your using good quality RG6 coax cable up to the modem. 
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/

Have the ISP check the event logs for those criticals, errors and warnings. They need to resolve them.