Intermittent Disconnections- Motorolla 7700

  We have experienced intermittent internet disruptions for 10 years now.  I have tried acquiring new hardware, we've run all new cable wires to the panel and all new electrical to the outlet where the modem is connected.  We've had 3 technicians, that I recall, look at the issue, the last of whom ran new wires.  I have no idea what else to try.  Signal drops for longer durations generally 5-6 times per week, speeds are generally ~5 mbps, I think there are many "little drops" that occur with much more frequency.  My work VPN will drop and reconnect ~40 times per day sometimes.  Any ideas?

  Event Log currently looks like this:

Log

Time   Priority   Description   Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;   Fri Sep 03 12:00:39 2021    Critical (3)   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=3.0;   Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;   Sun Sep 05 12:33:49 2021    Critical (3)   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=3.0;   Sun Sep 05 12:33:55 2021    Critical (3)   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=3.0;   Sun Sep 05 12:34:56 2021    Critical (3)   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=3.0;   Sun Sep 05 12:34:56 2021    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0;   Sun Sep 05 12:35:16 2021    Critical (3)   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=3.0;   Sun Sep 05 12:35:16 2021    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0;   Sun Sep 05 12:35:36 2021    Critical (3)   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=3.0;   Sun Sep 05 12:35:36 2021    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0;   Sun Sep 05 12:35:39 2021    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;   Sun Sep 05 12:36:51 2021    Critical (3)   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=1.0;CM-VER=3.0;   Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;   Sun Sep 05 18:41:20 2021    Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0;   Mon Sep 06 17:45:52 2021    Critical (3)   Resetting the cable modem due to docsDevResetNow   Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;   Thu Sep 23 05:32:42 2021    Critical (3)   Resetting the cable modem due to docsDevResetNow   Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;   Sat Sep 25 14:12:40 2021    Critical (3)   Resetting the cable modem due to docsDevResetNow   Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;   Sat Oct 02 16:30:46 2021    Critical (3)   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=3.0;   Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.0;CM-VER=3.0;   Wed Oct 13 05:29:09 2021    Critical (3)   Resetting the cable modem due to docsDevResetNow   Wed Oct 13 10:50:26 2021    Critical (3)   Resetting the cable modem due to docsDevResetNow   Time Not Established   Notice (6)   Honoring MDD; IP provisioning mode = IPv6

And Upstream/Downstream currently like:

tartup Step Status Comment       Acquire Downstream Channel 507000000 Hz Locked       Upstream Connection OK Operational       Boot State OK Operational       Configuration File OK       Security Enabled BPI+

Connection Status

System Up Time 0 days 08h:14m:28s         Network Access Allowed

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected 1 Locked QAM256 13 507.0 -1.6 36.5 0 0 2 Locked QAM256 1 435.0 -3.2 40.4 0 0 3 Locked QAM256 2 441.0 -3.5 40.3 1 0 4 Locked QAM256 3 447.0 -3.4 40.4 0 0 5 Locked QAM256 4 453.0 -3.4 40.3 1 0 6 Locked QAM256 5 459.0 -3.1 40.3 1 0 7 Locked QAM256 6 465.0 -2.9 40.3 0 0 8 Locked QAM256 7 471.0 -2.7 39.9 3 0 9 Locked QAM256 8 477.0 -2.6 40.3 1 0 10 Locked QAM256 10 489.0 -1.9 40.4 2 0 11 Locked QAM256 11 495.0 -1.7 40.4 3 0 12 Locked QAM256 12 501.0 -1.5 40.5 1 0 13 Locked QAM256 9 483.0 -2.4 40.2 1 0 14 Locked QAM256 14 513.0 -1.7 40.4 3 0 15 Locked QAM256 15 519.0 -1.6 40.5 2 0 16 Locked QAM256 16 525.0 -1.7 40.4 0 0 17 Locked QAM256 17 531.0 -1.0 42.2 2 0 18 Locked QAM256 18 537.0 -1.1 41.9 1 0 19 Locked QAM256 19 543.0 -1.1 42.1 1 0 20 Locked QAM256 20 549.0 -0.7 42.0 1 0 21 Locked QAM256 21 555.0 -0.7 42.1 1 0 22 Locked QAM256 22 561.0 -0.8 42.1 0 0 23 Locked QAM256 23 567.0 -0.8 42.2 0 0 24 Locked QAM256 24 573.0 -0.5 42.2 2 0 Total             27 0

Upstream Bonded Channels

Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV) 1 Locked ATDMA 7 5120 23.7 46.0 2 Locked ATDMA 5 5120 36.5 44.5 3 Locked ATDMA 6 5120 30.1 46.0 4 Locked ATDMA 8 5120 17.3 46.5 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