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Saturday, December 13th, 2025 11:42 PM

Dropped conection multiple times a day for only 2 minutes at a time

Hi, looking for some help diagnosing the data from my Netgear CM1200 when I lose internet connection at various times of the day for only a couple minutes at a time.  It's become very frustrating.  I've replaced and ensured the coax cable is properly seated on both ends.  Thanks very much for any assistance.  Here's my event log:

Sat Dec 13 18:18:42 2025 Critical (3) UCD invalid or channel unusable;CM-MAC=94:18:65:xx:xx:xx;CMTS-MAC=00:90:f0:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
Sat Dec 13 18:18:35 2025 Notice (6) DS profile assignment change. DS Chan ID: 33; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=94:18:65:xx:xx:xx;CMTS-MAC=00:90:f0:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
Sat Dec 13 18:18:33 2025 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=94:18:65:xx:xx:xx;CMTS-MAC=00:90:f0:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
Sat Dec 13 18:18:32 2025 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=94:18:65:xx:xx:xx;CMTS-MAC=00:90:f0:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
Sat Dec 13 18:18:28 2025 Notice (6) TLV-11 - unrecognized OID;CM-MAC=94:18:65:xx:xx:xx;CMTS-MAC=00:90:f0:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
Sat Dec 13 18:18:18 2025 Notice (6) Honoring MDD; IP provisioning mode = IPv6
Sat Dec 13 18:18:15 2025 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=94:18:65:xx:xx:xx;CMTS-MAC=00:90:f0:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
Sat Dec 13 18:18:13 2025 Critical (3) UCD invalid or channel unusable;CM-MAC=94:18:65:xx:xx:xx;CMTS-MAC=00:90:f0:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
Sat Dec 13 18:18:06 2025 Warning (5) ToD request sent - No Response received;CM-MAC=94:18:65:xx:xx:xx;CMTS-MAC=00:90:f0:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=94:18:65:xx:xx:xx;CMTS-MAC=00:90:f0:xx:xx:xx;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=94:18:65:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Warning (5) Lost MDD Timeout;CM-MAC=94:18:65:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;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=94:18:65:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

And here is my channels right after internet re connectivity:

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 423000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enabled BPI+
IP Provisioning Mode Honor MDD IPv6 only
 
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 4 423000000 Hz 3.4 dBmV 45.2 dB 0 0
2 Locked QAM256 1 405000000 Hz 3.4 dBmV 44.9 dB 0 0
3 Locked QAM256 2 411000000 Hz 3.4 dBmV 44.7 dB 0 0
4 Locked QAM256 3 417000000 Hz 3.4 dBmV 45.2 dB 0 0
5 Locked QAM256 5 429000000 Hz 3.5 dBmV 45.3 dB 0 0
6 Locked QAM256 6 435000000 Hz 3.5 dBmV 45.3 dB 0 0
7 Locked QAM256 7 441000000 Hz 3.4 dBmV 45.3 dB 0 0
8 Locked QAM256 8 447000000 Hz 3.4 dBmV 45.3 dB 0 0
9 Locked QAM256 9 453000000 Hz 3.4 dBmV 45.3 dB 0 0
10 Locked QAM256 10 459000000 Hz 3.5 dBmV 45.3 dB 0 0
11 Locked QAM256 11 465000000 Hz 3.5 dBmV 45.3 dB 0 0
12 Locked QAM256 12 471000000 Hz 3.6 dBmV 45.3 dB 0 0
13 Locked QAM256 13 477000000 Hz 3.6 dBmV 45.4 dB 0 0
14 Locked QAM256 14 483000000 Hz 3.6 dBmV 45.3 dB 0 0
15 Locked QAM256 15 489000000 Hz 3.7 dBmV 45.4 dB 0 0
16 Locked QAM256 16 495000000 Hz 3.7 dBmV 45.3 dB 0 0
17 Locked QAM256 17 501000000 Hz 3.6 dBmV 45.2 dB 0 0
18 Locked QAM256 18 507000000 Hz 3.6 dBmV 45.1 dB 0 0
19 Locked QAM256 19 513000000 Hz 3.6 dBmV 45.1 dB 0 0
20 Locked QAM256 20 519000000 Hz 3.4 dBmV 45.1 dB 0 0
21 Locked QAM256 21 525000000 Hz 3.4 dBmV 45 dB 0 0
22 Locked QAM256 22 531000000 Hz 3.4 dBmV 45 dB 0 0
23 Locked QAM256 23 537000000 Hz 3.3 dBmV 44.9 dB 0 0
24 Locked QAM256 24 543000000 Hz 3.2 dBmV 44.8 dB 0 0
25 Locked QAM256 25 549000000 Hz 2.9 dBmV 44.6 dB 0 0
26 Locked QAM256 26 561000000 Hz 3.2 dBmV 44.7 dB 0 0
27 Locked QAM256 27 567000000 Hz 3.3 dBmV 44.8 dB 0 0
28 Locked QAM256 28 573000000 Hz 3.3 dBmV 44.9 dB 0 0
29 Locked QAM256 29 579000000 Hz 3.3 dBmV 44.8 dB 0 0
30 Locked QAM256 30 585000000 Hz 3.3 dBmV 44.7 dB 0 0
31 Locked QAM256 31 591000000 Hz 3.4 dBmV 44.8 dB 0 0
32 Locked QAM256 32 597000000 Hz 3.5 dBmV 44.8 dB 0 0
 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 17 5120 Ksym/sec 16400000 Hz 43.5 dBmV
2 Locked ATDMA 18 5120 Ksym/sec 22800000 Hz 43.8 dBmV
3 Locked ATDMA 19 5120 Ksym/sec 29200000 Hz 43.8 dBmV
4 Locked ATDMA 20 5120 Ksym/sec 35600000 Hz 43.8 dBmV
5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
 
Downstream OFDM Channels
Channel Lock
Status		 Modulation /
Profile ID		 Channel
ID		 Frequency Power SNR /
MER		 Active Subcarrier
Number Range		 Unerrored
Codewords		 Correctable
Codewords		 Uncorrectable
Codewords
1 Locked 0 ,1 ,2 ,3 193 690000000 Hz 4.5 dBmV 44.5 dB 688 ~ 3407 28202103 10744866 0
2 Locked 0 ,1 ,2 ,3 194 957000000 Hz 7.4 dBmV 44.6 dB 148 ~ 3947 28987948 1611429 0
 
Upstream OFDMA Channels
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz

0 dBmV

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