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 ...

FURRYe38

Guru - Experienced User

May 12, 2023

Please post a copy and paste of the modems connection status full page page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router

Any Critical, Errors or Warnings need in the event log indicates a signal line issue from the ISP service box and needs to be reviewed by the ISP and resolved.

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>

Procedure	Status	Comment
Acquire Downstream Channel	435000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enabled	BPI+
IP Provisioning Mode	Honor MDD	IPv6 only

<tabindex=-1>Downstream Bonded Channels</tabindex=-1>

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectabables
1	Locked	256 QAM	1	435000000 Hz	-2.8 dBmV	41.8 dB	63874	0
2	Locked	256 QAM	2	441000000 Hz	-3.1 dBmV	41.8 dB	63140	0
3	Locked	256 QAM	3	447000000 Hz	-2.9 dBmV	41.9 dB	63468	0
4	Locked	256 QAM	4	453000000 Hz	-2.9 dBmV	41.8 dB	63781	0
5	Locked	256 QAM	5	459000000 Hz	-3.4 dBmV	41.6 dB	64584	2613
6	Locked	256 QAM	6	465000000 Hz	-3.0 dBmV	41.8 dB	64015	921
7	Locked	256 QAM	7	471000000 Hz	-2.8 dBmV	41.9 dB	61158	270
8	Locked	256 QAM	8	477000000 Hz	-2.4 dBmV	42.2 dB	59259	0
9	Locked	256 QAM	9	483000000 Hz	-2.2 dBmV	42.3 dB	58599	0
10	Locked	256 QAM	10	489000000 Hz	-2.5 dBmV	42.3 dB	58074	0
11	Locked	256 QAM	11	495000000 Hz	-2.5 dBmV	42.4 dB	58148	0
12	Locked	256 QAM	12	501000000 Hz	-2.0 dBmV	42.5 dB	58234	0
13	Locked	256 QAM	13	507000000 Hz	-2.1 dBmV	42.5 dB	56772	0
14	Locked	256 QAM	14	513000000 Hz	-2.1 dBmV	42.6 dB	56477	0
15	Locked	256 QAM	15	519000000 Hz	-1.8 dBmV	42.7 dB	56251	0
16	Locked	256 QAM	16	525000000 Hz	-1.9 dBmV	42.8 dB	54080	0
17	Locked	256 QAM	17	531000000 Hz	-1.8 dBmV	43.0 dB	52160	0
18	Locked	256 QAM	18	537000000 Hz	-1.5 dBmV	43.0 dB	52088	0
19	Locked	256 QAM	19	543000000 Hz	-1.6 dBmV	43.0 dB	51506	0
20	Locked	256 QAM	20	549000000 Hz	-1.1 dBmV	43.2 dB	51202	0
21	Locked	256 QAM	21	555000000 Hz	0.8 dBmV	43.0 dB	49318	0
22	Locked	256 QAM	22	561000000 Hz	0.4 dBmV	43.3 dB	49420	0
23	Locked	256 QAM	23	567000000 Hz	0.5 dBmV	43.3 dB	48593	0
24	Locked	256 QAM	24	573000000 Hz	0.7 dBmV	43.2 dB	47290	0
25	Locked	256 QAM	25	579000000 Hz	0.8 dBmV	43.2 dB	46558	0
26	Locked	256 QAM	26	585000000 Hz	0.5 dBmV	43.3 dB	45735	0
27	Locked	256 QAM	27	591000000 Hz	0.3 dBmV	43.1 dB	45216	0
28	Locked	256 QAM	28	597000000 Hz	0.2 dBmV	43.3 dB	43858	0
29	Locked	256 QAM	29	603000000 Hz	0.3 dBmV	43.2 dB	43261	0
30	Locked	256 QAM	30	609000000 Hz	0.5 dBmV	43.2 dB	42796	0
31	Locked	256 QAM	31	615000000 Hz	0.5 dBmV	43.0 dB	43554	0
32	Locked	256 QAM	32	621000000 Hz	0.2 dBmV	42.6 dB	42961	0

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	2	5120 Ksym/sec	16400000 Hz	46.5 dBmV
2	Locked	ATDMA	3	5120 Ksym/sec	22800000 Hz	46.5 dBmV
3	Locked	ATDMA	4	5120 Ksym/sec	29200000 Hz	46.0 dBmV
4	Locked	ATDMA	5	5120 Ksym/sec	35600000 Hz	46.0 dBmV
5	Locked	ATDMA	6	5120 Ksym/sec	40400000 Hz	46.0 dBmV
6	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV
7	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV
8	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV

<tabindex=-1>Downstream OFDM Channels</tabindex=-1>

Channel	Channel ID	Frequency	Power	SNR/MER	Active Subcarrier Number Range	Total Codewords	Uncorrectable Codewords
1	159	702000000 Hz	3.4 dBmV	41.7 dB	1126 ~ 2969	856229075	0
2	0	0 Hz	0 dBmV	0 dB	0 ~ 0	0	0

<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>

Channel	UpstreamIsMuted	Ranging Status	Subcarrier Zero Frequency	Active Subcarrier Number Range	Symbols Per Frame	Tx Power
1		Other	0 MHz	0 ~ 0	0	0 dBmV
2		Other	0 MHz	0 ~ 0	0	0 dBmV

Extended Upstream Transmit Power

Enable Extended Upstream Transmit Power

Current System Time: 2023-05-15 10:58:17

System Up Time: 2Days, 20:38:47

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.

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Nighthawk cax30 dropping internet connectivity almost daily