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Just bought this modem the other day.  Spectrum shows good signal on their side, I can see from the modem diag page the signals are within spec but for some reason, every few hours, it tries to get a new profile.   Logs below are from in between WebGUI logins within a few hours.  

(edit: CM-MAC information removed by the moderator)

18/9/2023
07:29:51		 3 Successful LAN WebGUI login from ***.***.***.*** on 23/09/18 at 7:29 AM.
31/12/1969
19:00:16		 3 CMSTATUS:US_Diplexer_Mode_Change:Init, 5-42MHz.
31/12/1969
19:00:20		 3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
31/12/1969
19:00:23		 3 CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-85MHz.
18/9/2023
07:34:05		 3 CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-85MHz.
18/9/2023
08:00:35		 3 Successful LAN WebGUI login from ***.***.***.*** on 23/09/18 at 8:00 AM.
18/9/2023
09:15:25		 3 Successful LAN WebGUI login from ***.***.***.*** on 23/09/18 at 9:15 AM.
31/12/1969
19:00:16		 3 CMSTATUS:US_Diplexer_Mode_Change:Init, 5-42MHz.
31/12/1969
19:00:19		 3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
31/12/1969
19:00:22		 3 CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-85MHz.
31/12/1969
19:00:32		 6 Honoring MDD; IP provisioning mode = IPv4
31/12/1969
19:00:34		 5 DHCP WARNING - Non-critical field invalid in response ;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
18/9/2023
09:51:35		 4 Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
18/9/2023
09:51:35		 4 Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
18/9/2023
09:51:36		 6 TLV-11 - unrecognized OID;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
18/9/2023
09:51:39		 3 CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-85MHz.
18/9/2023
09:51:47		 6 Overriding MDD IP initialization parameters; IP provisioning mode = IPv6
18/9/2023
09:51:55		 4 Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
18/9/2023
09:51:55		 4 Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
18/9/2023
09:51:56		 6 TLV-11 - unrecognized OID;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
18/9/2023
09:51:57		 6 DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
18/9/2023
09:52:05		 5 RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
18/9/2023
09:52:05		 5 Dynamic Range Window violation
18/9/2023
09:52:05		 5 RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
18/9/2023
09:52:05		 5 Dynamic Range Window violation
18/9/2023
09:52:05		 5 RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
18/9/2023
09:52:05		 5 Dynamic Range Window violation
18/9/2023
09:52:15		 6 US profile assignment change. US Chan ID: 8; Previous Profile: 13; New Profile: 11 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
18/9/2023
09:54:07		 3 Successful LAN WebGUI login from ***.***.***.*** on 23/09/18 at 9:54 AM.

Hello sneffy80

                         The logs are Values read by technicians from the internet provider end, since the logs are what the coaxial cable transmits and the log screen on the router is the translator so can be easily read by them, the coaxial cable is owned by the Internet service provider, we wouldn't be able to tell you what that means.

If your Event Log is reporting a high volume of errors, this would indicate a potential CMTS signal issue. To troubleshoot these errors, we would like to note the current signal levels being used by your (S33).

                          Here we need to check the way the signal comes from out to inside the home. There are some important things that should be within a specific range in order for the internet to work properly.

First, the SNR should be above 33 on all of them. The downstream power should always be between -15 and +15. The closer to 0 the better connection. Finally, your upstream power should always be between +45 and +51

On all of those values you should not have more than 3 decibels (or dB) between the lowest and the highest. By having the values in less than that, your device will have interrupted connection, slow or no connection at all. Please follow the steps mentioned on the below link to check the cable signal level

                       http://arris.force.com/consumers/articles/General_FAQs/S33-Cable-Signal-Levels

                    

No worries, thanks for the redundant info.  Spectrum tech came out, line was clean, no errors every thing was correct on voltage.  Tech showed me the screen.  Spectrum just didnt like your modem.  I returned it to Best Buy and just put back the Spectrum modem they provide,  my internet is doing fine for now.  Thanks anyways. 

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