Intermittent downtime -- is it Cox or my modem?

Hello Team Cox.  I've got an ongoing issue whereby my internet connection goes down.  Usually for about a minute or two.  I don't know if it's my modem or connection.

I've got an amazing router and WAPs.  Both have logs.  It's not them.  And to prove it, devices wired to the router go down as well as wifi devices. 

Below are my logs.  I've got a Netgear MB8600 (2yrs old).  I had someone come out earlier this year and replace a cable.  But the problem persists.  Any advice -- is it time to call Cox back out or buy another modem?  Thanks!

Time    Priority    Description 
    05:03:18
Mon Aug 30 2021
  Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:a3:d1:5c:be:3c;CM-QOS=1.1;CM-VER=3.1;
    05:03:38
Mon Aug 30 2021
  Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:a3:d1:5c:be:3c;CM-QOS=1.1;CM-VER=3.1;
    05:03:38
Mon Aug 30 2021
  Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:a3:d1:5c:be:3c;CM-QOS=1.1;CM-VER=3.1;
    05:03:58
Mon Aug 30 2021
  Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:a3:d1:5c:be:3c;CM-QOS=1.1;CM-VER=3.1;
    05:03:58
Mon Aug 30 2021
  Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:a3:d1:5c:be:3c;CM-QOS=1.1;CM-VER=3.1;
    05:04:18
Mon Aug 30 2021
  Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:a3:d1:5c:be:3c;CM-QOS=1.1;CM-VER=3.1;
    05:04:18
Mon Aug 30 2021
  Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:a3:d1:5c:be:3c;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    06:56:41
Mon Aug 30 2021
  Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    06:57:51
Mon Aug 30 2021
  Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    06:58:15
Mon Aug 30 2021
  Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    06:58:19
Mon Aug 30 2021
  Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    14:45:29
Sun Sep 12 2021
  Critical (3)   SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Notice (6)   Honoring MDD; IP provisioning mode = IPv4
    10:46:47
Thu Sep 23 2021
  Warning (5)   DHCP WARNING - Non-critical field invalid in response ;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    10:46:47
Thu Sep 23 2021
  Notice (6)   TLV-11 - unrecognized OID;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    10:46:53
Thu Sep 23 2021
  Notice (6)   DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;
    10:46:58
Thu Sep 23 2021
  Warning (5)   REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=00:40:36:5c:f8:1d;CMTS-MAC=3c:41:0e:1e:e6:3f;CM-QOS=1.1;CM-VER=3.1;

Connection
   Startup Sequence    
   Startup Step Status Comment

  
   Acquire Downstream Channel 903000000 Hz Locked
  
   Upstream Connection OK Operational
  
   Boot State OK Operational

  
   Configuration File OK
  
   Security Enabled BPI+
  


   Connection Status    
   System Up Time 0 days 06h:16m:49s  
  
   Network Access Allowed  
  


   Downstream Bonded Channels  
  
   Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected
   1 Locked QAM256 21 903.0 3.4 43.0 0 0
   2 Locked QAM256 1 783.0 3.7 43.7 2190 2202
   3 Locked QAM256 2 789.0 3.7 43.6 0 0
   4 Locked QAM256 3 795.0 3.6 43.4 0 0
   5 Locked QAM256 4 801.0 3.6 43.4 0 0
   6 Locked QAM256 5 807.0 3.5 43.5 0 0
   7 Locked QAM256 6 813.0 3.5 43.4 0 0
   8 Locked QAM256 7 819.0 3.5 43.4 0 0
   9 Locked QAM256 8 825.0 3.4 43.3 0 0
   10 Locked QAM256 9 831.0 3.4 43.3 0 0
   11 Locked QAM256 10 837.0 3.6 43.4 0 0
   12 Locked QAM256 11 843.0 3.6 43.4 0 0
   13 Locked QAM256 12 849.0 3.7 43.4 0 0
   14 Locked QAM256 13 855.0 3.8 43.6 0 0
   15 Locked QAM256 14 861.0 3.8 43.3 0 0
   16 Locked QAM256 15 867.0 3.7 43.2 0 0
   17 Locked QAM256 16 873.0 3.8 43.3 0 0
   18 Locked QAM256 17 879.0 3.8 43.3 0 0
   19 Locked QAM256 18 885.0 3.7 43.2 0 0
   20 Locked QAM256 19 891.0 3.6 43.2 0 0
   21 Locked QAM256 20 897.0 3.5 43.2 0 0
   22 Locked QAM256 22 909.0 3.3 43.0 0 0
   23 Locked QAM256 23 915.0 3.3 42.9 0 0
   24 Locked QAM256 24 921.0 3.1 42.8 0 0
   25 Locked QAM256 25 927.0 2.9 42.6 0 0
   26 Locked QAM256 26 933.0 2.8 42.5 0 0
   27 Locked QAM256 27 939.0 2.4 42.3 0 0
   28 Locked QAM256 28 945.0 2.1 42.1 1 0
   29 Locked QAM256 29 951.0 1.7 41.8 0 0
   30 Locked QAM256 30 957.0 1.3 41.6 0 0
   31 Locked QAM256 31 963.0 0.9 41.3 1 0
   32 Locked QAM256 32 969.0 0.6 40.9 0 0
   33 Locked OFDM PLC 159 348.0 4.9 45.3 69073772 0


   Upstream Bonded Channels  
  
   Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV)
   1 Locked SC-QAM 1 5120 17.6 40.3
   2 Locked SC-QAM 2 5120 24.0 40.5
   3 Locked SC-QAM 3 5120 30.4 41.0
   4 Locked SC-QAM 4 5120 36.8 41.0
   5 Locked SC-QAM 6 2560 12.8 40.0

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