Poor Upstream Power Level? And what does this mean: Critical SYNC Timing Synchronization failure - Failed to acquire QAM

I was having connection issues all day Saturday 10/1, and today my combo modem/router is still diagnosing my cable connection as "Poor," specifically my Upstream Power Level as "Poor" at 51.0sBmV.

I am also seeing a lot of SYNC Timing Synchronization failures listed on the diagnostic report, and they're all flagged as "Critical," but I have no idea what any of that means.

There are no splitters between my modem (Netgear Nighthawk CAX80) and the wall outlet. I have tried two different RG6 coax cables, and I get the same numbers using both.

Here is the latest diagnostic report from my CAX80:

Cable Diagnostic

Status: Poor

Action: 
[Upstream Power Level]
Try these actions (Click the Refresh button after each step):
1) Make sure the coaxial cable is tightly connected.
2) Remove any unnecessary splitters.
3) Replace any required splitters.
4) Contact your service provider for troubleshooting help.

Internet Access: Good

Downstream Status: Good

    Downstream Power Level: Good

    Downstream SNR: Good

Upstream Status:  Poor

    Upstream Power Level: Poor
    Upstream power is poor (51.0dBmV). The recommended level is from 30 to 50dBmV.

Current time: Sun Oct 02 13:06:18 2022

Startup Procedure
Acquire Downstream Channel: 507 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      5     507000000 Hz     2.4 dBmV     42.5 dB     232     702
      2     Locked     256 QAM      2     489000000 Hz     2.1 dBmV     42.5 dB     2910     2558
      3     Locked     256 QAM      3     495000000 Hz     2.4 dBmV     42.6 dB     1221     2246
      4     Locked     256 QAM      4     501000000 Hz     2.4 dBmV     42.6 dB     1428     6105
      5     Locked     256 QAM      6     513000000 Hz     2.4 dBmV     42.5 dB     1232     5129
      6     Locked     256 QAM      7     519000000 Hz     2.4 dBmV     42.4 dB     3051     3768
      7     Locked     256 QAM      8     525000000 Hz     2.3 dBmV     42.4 dB     709     2172
      8     Locked     256 QAM      9     531000000 Hz     2.1 dBmV     42.2 dB     671     1960
      9     Locked     256 QAM     10     537000000 Hz     2.4 dBmV     42.3 dB     737     2559
     10     Locked     256 QAM     11     543000000 Hz     2.5 dBmV     42.4 dB     1046     2563
     11     Locked     256 QAM     12     549000000 Hz     2.3 dBmV     42.4 dB     1795     2812
     12     Locked     256 QAM     13     555000000 Hz     2.1 dBmV     42.2 dB     2539     3069
     13     Locked     256 QAM     14     561000000 Hz     2.2 dBmV     42.2 dB     1996     2749
     14     Locked     256 QAM     15     567000000 Hz     1.8 dBmV     42.1 dB     1923     2950
     15     Locked     256 QAM     16     573000000 Hz     1.6 dBmV     42 dB     1195     2586
     16     Locked     256 QAM     17     579000000 Hz     1.6 dBmV     41.9 dB     909     2587
     17     Locked     256 QAM     18     585000000 Hz     1.6 dBmV     41.8 dB     788     2584
     18     Locked     256 QAM     19     591000000 Hz     1.4 dBmV     41.8 dB     937     2555
     19     Locked     256 QAM     20     597000000 Hz     1.3 dBmV     41.8 dB     720     2586
     20     Locked     256 QAM     21     603000000 Hz     1.5 dBmV     41.7 dB     704     2544
     21     Locked     256 QAM     22     609000000 Hz     1.3 dBmV     41.6 dB     726     2568
     22     Locked     256 QAM     23     615000000 Hz     1.1 dBmV     41.5 dB     880     2605
     23     Locked     256 QAM     24     621000000 Hz     1.2 dBmV     41.4 dB     1095     3928
     24     Locked     256 QAM     25     627000000 Hz     1.1 dBmV     41.4 dB     357     1256
     25     Locked     256 QAM     26     633000000 Hz     1 dBmV     41.3 dB     2442     6955
     26     Locked     256 QAM     27     639000000 Hz     1 dBmV     41.4 dB     2887     6332
     27     Locked     256 QAM     28     645000000 Hz     1.2 dBmV     41.5 dB     2346     3605
     28     Locked     256 QAM     30     651000000 Hz     1.1 dBmV     41.4 dB     1226     3398
     29     Locked     256 QAM     31     657000000 Hz     1 dBmV     41.4 dB     748     2495
     30     Locked     256 QAM     32     663000000 Hz     1.2 dBmV     41.3 dB     693     2509
     31     Locked     256 QAM     33     669000000 Hz     1.2 dBmV     41.4 dB     755     2500
     32     Not Locked     Unknown      0     0 Hz     0.0     0.0     0     0

Upstream Bonded Channels
Channel   LockedStatus  ChannelType ChannelID   SymbolRate        Frequency       Power     
      1       Locked       ATDMA      4       5120 Ksym/sec       16400000 Hz       45.0 dBmV
      2       Locked       ATDMA      1       5120 Ksym/sec       35600000 Hz       45.3 dBmV
      3       Locked       ATDMA      3       5120 Ksym/sec       22800000 Hz       45.0 dBmV
      4       Locked       ATDMA      2       5120 Ksym/sec       29200000 Hz       44.8 dBmV
      5       Locked       ATDMA      5       1280 Ksym/sec       39600000 Hz       51.0 dBmV
      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 ,3     37     690000000 Hz     1.38 dBmV     41.3 dB     1108 ~ 2987     47997405     47392203     2968
      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
Sun Oct  2 13:06:41 2022     Notice     CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0 1 2 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:06:24 2022     Notice     CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0 2 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:06:12 2022     Notice     CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:06:08 2022     Notice     CM-STATUS message sent. Event Type Code: 22; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:05:49 2022     Notice     CM-STATUS message sent. Event Type Code: 23; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:04:02 2022     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:04:01 2022     Warning     MDD message timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:03:56 2022     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:03:55 2022     Warning     MDD message timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:03:52 2022     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:02:00 2022     Notice     CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0 1 2 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:01:37 2022     Notice     CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0 2 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:01:30 2022     Notice     CM-STATUS message sent. Event Type Code: 22; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:01:24 2022     Notice     CM-STATUS message sent. Event Type Code: 23; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:01:5c:a3:f8:56;CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 13:01:05 2022     Critical     Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=6c:cd:d6:69:77:74;CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 12:59:37 2022     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=6c:cd:d6:69:77:74;CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 12:59:37 2022     Warning     MDD message timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 12:59:31 2022     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 12:59:31 2022     Warning     MDD message timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 12:59:28 2022     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 11:28:47 2022     Notice     DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 11:28:28 2022     Notice     TLV-11 - unrecognized OID;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:00:56 1970     Notice     Honoring MDD; IP provisioning mode = IPv6
Thu Jan  1 00:00:50 1970     Critical     No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"]CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:00:43 1970     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Oct  2 11:26:20 2022     Critical     Resetting the cable modem due to docsDevResetNow
Thu Jan  1 00:00:43 1970     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:00:47 1970     Critical     No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:00:43 1970     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sat Oct  1 14:56:53 2022     Critical     Resetting the cable modem due to docsDevResetNow
Thu Jan  1 00:00:47 1970     Critical     No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:00:43 1970     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sat Oct  1 10:21:33 2022     Critical     Resetting the cable modem due to docsDevResetNow
Thu Jan  1 00:00:49 1970     Critical     No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:00:43 1970     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:00:47 1970     Critical     No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:00:43 1970     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sat Oct  1 09:27:27 2022     Critical     Resetting the cable modem due to docsDevResetNow
Thu Sep 29 12:15:42 2022     Critical     Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Sep 29 07:43:16 2022     Critical     Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;