My router/modem also reboots every night at 3am

[rksalm]

Same issue here with the new firmware banner, yet I ma on the latest - started on 6/10/22.  My router/modem also reboots every night at 3am.  Re login, re enter security questions everyday.  Then the internet works fine all day until the next night reboot.

Spectrum Internet -

Firmware Version	V2.1.3.7
Cable Firmware Version	V1.02.08

[FURRYe38]

Please post a copy and paste of the modems connection status page.
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.

Are they seeing these disconnects on there side in there logs as well when this happens? 

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. 
Be sure to power OFF the modem for 2 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Mod...
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router?article=24311
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html

[rksalm]

Thanks for the reply.  The said all signal strangths looked good from their end.  Also, the disconnect or reboot is one issue, but why does the router constantly think I need new firmware and require me to enter a new password and new security questions every single time it power cycles?

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: Good

Downstream Status: Good

Downstream Power Level: Good

Downstream SNR: Good

Upstream Status: Good

Upstream Power Level: Good

Current time: Fri Jun 17 15:22:28 2022

Startup Procedure
Acquire Downstream Channel: 387 MHz Locked
Connectivity State: OK Operational
Boot State: OK Operational
Security: Enabled BPI+

Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked 256 QAM 22 387000000 Hz -0.7 dBmV 43.2 dB 0 0
2 Locked 256 QAM 1 261000000 Hz 0.6 dBmV 43.8 dB 0 0
3 Locked 256 QAM 2 267000000 Hz 0.4 dBmV 43.7 dB 0 0
4 Locked 256 QAM 3 273000000 Hz 0.2 dBmV 43.6 dB 0 0
5 Locked 256 QAM 4 279000000 Hz 0 dBmV 43.4 dB 0 0
6 Locked 256 QAM 5 285000000 Hz 0.1 dBmV 43.6 dB 0 0
7 Locked 256 QAM 6 291000000 Hz -0.4 dBmV 43.3 dB 0 0
8 Locked 256 QAM 7 297000000 Hz -0.1 dBmV 43.4 dB 0 0
9 Locked 256 QAM 8 303000000 Hz 0 dBmV 43.4 dB 0 0
10 Locked 256 QAM 9 309000000 Hz 0 dBmV 43.7 dB 0 0
11 Locked 256 QAM 10 315000000 Hz 0 dBmV 43.5 dB 0 0
12 Locked 256 QAM 11 321000000 Hz -0.2 dBmV 43.4 dB 0 0
13 Locked 256 QAM 12 327000000 Hz -0.4 dBmV 43.3 dB 0 0
14 Locked 256 QAM 13 333000000 Hz -0.4 dBmV 43.2 dB 0 0
15 Locked 256 QAM 14 339000000 Hz -0.4 dBmV 43.1 dB 0 0
16 Locked 256 QAM 15 345000000 Hz -0.4 dBmV 43.4 dB 0 0
17 Locked 256 QAM 16 351000000 Hz -0.5 dBmV 43.2 dB 0 0
18 Locked 256 QAM 17 357000000 Hz -0.2 dBmV 43.4 dB 0 0
19 Locked 256 QAM 18 363000000 Hz -0.5 dBmV 43.3 dB 0 0
20 Locked 256 QAM 19 369000000 Hz -0.8 dBmV 43.1 dB 0 0
21 Locked 256 QAM 20 375000000 Hz -0.6 dBmV 43.3 dB 0 0
22 Locked 256 QAM 21 381000000 Hz -0.5 dBmV 43.3 dB 0 0
23 Locked 256 QAM 23 393000000 Hz -0.4 dBmV 43.4 dB 0 0
24 Locked 256 QAM 24 399000000 Hz -0.7 dBmV 43.3 dB 0 0
25 Locked 256 QAM 25 405000000 Hz -0.5 dBmV 43.3 dB 0 0
26 Locked 256 QAM 26 411000000 Hz -0.7 dBmV 43.2 dB 0 0
27 Locked 256 QAM 27 417000000 Hz -0.7 dBmV 43.3 dB 0 0
28 Locked 256 QAM 28 423000000 Hz -0.5 dBmV 43.4 dB 0 0
29 Locked 256 QAM 29 429000000 Hz -0.8 dBmV 43.2 dB 0 0
30 Locked 256 QAM 30 435000000 Hz -0.6 dBmV 43.3 dB 0 0
31 Locked 256 QAM 31 447000000 Hz -0.5 dBmV 43.6 dB 0 0
32 Locked 256 QAM 32 453000000 Hz -0.6 dBmV 43.4 dB 0 0

Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 6 5120 Ksym/sec 24200000 Hz 38.3 dBmV
2 Locked ATDMA 5 5120 Ksym/sec 17800000 Hz 37.0 dBmV
3 Locked ATDMA 7 5120 Ksym/sec 30600000 Hz 38.3 dBmV
4 Locked ATDMA 8 5120 Ksym/sec 37000000 Hz 40.0 dBmV
5 Not Locked Unknown 0 0 0 0.0
6 Not Locked Unknown 0 0 0 0.0
7 Not Locked Unknown 0 0 0 0.0
8 Not Locked Unknown 0 0 0 0.0

Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Locked 0 ,1 ,2 33 465000000 Hz -0.52 dBmV 42.9 dB 1108 ~ 2987 152733992 130194988 0
2 Not Locked 0 0 0 Hz 0 dBmV 0 dB 0 ~ 4095 0 0 0

Upstream OFDMA Channels
Channel LockedStatus ProfileID ChannelID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV

Event Log
Time Priority Description
Fri Jun 17 13:50:05 2022 Critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:17:10:9c:48:8d;CM-QOS=1.1;CM-VER=3.1;
Fri Jun 17 13:50:02 2022 Notice DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2.;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:17:10:9c:48:8d;CM-QOS=1.1;CM-VER=3.1;
Fri Jun 17 13:49:27 2022 Notice TLV-11 - unrecognized OID;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:17:10:9c:48:8d;CM-QOS=1.1;CM-VER=3.1;
Fri Jun 17 13:49:27 2022 Error Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:17:10:9c:48:8d;CM-QOS=1.1;CM-VER=3.1;
Fri Jun 17 13:49:27 2022 Error Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:17:10:9c:48:8d;CM-QOS=1.1;CM-VER=3.1;
Fri Jun 17 13:49:27 2022 Warning DHCP WARNING - Non-critical field invalid in response ;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:17:10:9c:48:8d;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:49 1970 Notice Honoring MDD; IP provisioning mode = IPv4
Thu Jan 1 00:00:44 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Fri Jun 17 13:47:39 2022 Critical Resetting the cable modem due to docsDevResetNow
Fri Jun 17 01:31:37 2022 Critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:17:10:9c:48:8d;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:44 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jun 16 01:27:33 2022 Critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:17:10:9c:48:8d;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:44 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Tue Jun 14 03:19:30 2022 Critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:17:10:9c:48:8d;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:44 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Jun 12 08:11:45 2022 Critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:17:10:9c:48:8d;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:00:44 1970 Critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:3e:9d:70;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

[FURRYe38]

Well Downstream does look ok.

However:

Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Locked 0 ,1 ,2 33 465000000 Hz -0.52 dBmV 42.9 dB 1108 ~ 2987 152733992 130194988 0

I can't tell for sure however if these two values are seen under the correctable and uncorrectable columns, then the ISP needs to look in to this. These should be Zero. This could be a possible cause. 

I see you have some Criticals as well that the ISP should look into as well. 

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. 
Be sure all coax jack fittings are good and tight. 

Be sure to have the ISP check there logs around 3AM to see if this notice anything with your modem...