Internet dumps after a few hours

[drbob2112]

Just had gigabit upgrade.  Have Netgear CM1200 modem.  Internet speeds will come to a crawl (less than 1Mbps) for a few minutes about every 15-30 minutes....and then "magically" pop back up to 800mbps. 

Seeing these errors on the modem:
Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;

Wed Jul 08 15:37:50 2020	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 15:18:08 2020	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 15:18:03 2020	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;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=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;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=08:36:c9:3f:87:18;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 15:16:29 2020	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 11:28:27 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 11:27:57 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 11:22:28 2020	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:57:49 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:57:15 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:54:06 2020	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:44:05 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:43:34 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:43:22 2020	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:43:03 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:42:33 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:42:17 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:41:36 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:40:48 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:39:48 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:38:32 2020	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:35:04 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:34:39 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:34:13 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:33:29 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:30:45 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:30:15 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:29:48 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:28:19 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:27:54 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:27:13 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:27:08 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:25:14 2020	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:24:13 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:24:06 2020	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:23:41 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:23:10 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;
Wed Jul 08 10:23:06 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=08:36:c9:3f:87:18;CMTS-MAC=00:01:5c:a9:ba:5e;CM-QOS=1.1;CM-VER=3.1;

**********************
And here is the current connection information:

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 5 549000000 Hz -2.2 dBmV 42.4 dB 0 0 2 Locked QAM256 1 525000000 Hz -2 dBmV 42.6 dB 0 0 3 Locked QAM256 2 531000000 Hz -2.1 dBmV 42.4 dB 0 0 4 Locked QAM256 3 537000000 Hz -2.3 dBmV 42.4 dB 0 0 5 Locked QAM256 4 543000000 Hz -2.5 dBmV 42.2 dB 0 0 6 Locked QAM256 6 555000000 Hz -2.3 dBmV 42.4 dB 0 0 7 Locked QAM256 7 561000000 Hz -2.5 dBmV 42.3 dB 0 0 8 Locked QAM256 8 567000000 Hz -2.3 dBmV 42.4 dB 0 0 9 Locked QAM256 9 573000000 Hz -2.5 dBmV 42.2 dB 0 0 10 Locked QAM256 10 579000000 Hz -2.8 dBmV 42.1 dB 0 0 11 Locked QAM256 11 585000000 Hz -2.6 dBmV 42.2 dB 0 0 12 Locked QAM256 12 591000000 Hz -2.6 dBmV 42.3 dB 0 0 13 Locked QAM256 13 597000000 Hz -2.6 dBmV 42.2 dB 0 0 14 Locked QAM256 14 603000000 Hz -2.8 dBmV 42.2 dB 0 0 15 Locked QAM256 15 609000000 Hz -3.1 dBmV 42.1 dB 0 0 16 Locked QAM256 16 615000000 Hz -3 dBmV 42.1 dB 0 0 17 Locked QAM256 17 621000000 Hz -3 dBmV 42.1 dB 0 0 18 Locked QAM256 18 627000000 Hz -3.2 dBmV 42 dB 0 0 19 Locked QAM256 19 633000000 Hz -3.1 dBmV 42.1 dB 0 0 20 Locked QAM256 20 639000000 Hz -2.9 dBmV 42.1 dB 0 0 21 Locked QAM256 21 645000000 Hz -3.3 dBmV 41.9 dB 0 0 22 Locked QAM256 22 651000000 Hz -3.2 dBmV 42 dB 0 0 23 Locked QAM256 23 657000000 Hz -2.9 dBmV 42.2 dB 0 0 24 Locked QAM256 32 495000000 Hz -2 dBmV 42.3 dB 0 0 25 Locked QAM256 34 507000000 Hz -1.9 dBmV 42.4 dB 0 0 26 Locked QAM256 35 513000000 Hz -1.8 dBmV 42.6 dB 0 0 27 Locked QAM256 36 519000000 Hz -2.1 dBmV 42.6 dB 0 0 28 Locked QAM256 38 471000000 Hz -2.1 dBmV 42.6 dB 0 0 29 Locked QAM256 39 477000000 Hz -1.9 dBmV 42.7 dB 0 0 30 Locked QAM256 40 483000000 Hz -2.2 dBmV 42.5 dB 0 0 31 Locked QAM256 41 489000000 Hz -2 dBmV 42.6 dB 0 0 32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0

Upstream Bonded Channels

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 1 5120 Ksym/sec 35800000 Hz 50.3 dBmV 2 Locked ATDMA 2 5120 Ksym/sec 29400000 Hz 51 dBmV 3 Locked ATDMA 3 5120 Ksym/sec 23000000 Hz 51 dBmV 4 Locked ATDMA 4 5120 Ksym/sec 16600000 Hz 51 dBmV 5 Locked ATDMA 9 1280 Ksym/sec 39800000 Hz 48.3 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 37 762000000 Hz -4.1 dBmV 41.3 dB 1108 ~ 2987 19031637 2293532 0 2 Not Locked 0 0 0 Hz 0 dBmV 0.0 dB 0 ~ 4095 0 0 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

Extended Upstream Transmit Power

Enable Extended Upstream Transmit Power

Current System Time:Wed Jul 08 15:50:44 2020

System Up Time:00:33:25

Keep in mind this: I JUST rebooted the modem about a half hour ago and things are cooking fine...but i reooted it yesterday, and the day before, and the day before etc....I have alreayd done 30-30-30 and checked all the connections - even to the main connection because the guys who buried the cable did not lock the box back up.

There's the connection from the main line to my house on the outside, then from the outside into my house into a 3 way splitter (supplied by comcast), of which ther eare only 2 splits - one to the TV upstairs, and one to the modem in the basement.

Suggestions? Starting to wonder if here's an issue with the line.  Things were working fine for a few days while the new cable was laying above ground, but ever since it was buried we've been having these issues.

[EG]

The upstream power is too high and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.

[drbob2112]

Yup as I mentioned - the only splitter in line here is one installed by comcast.  It IS a 3 way with only 2 lines coming out of it - I thought about getting a terminator for the 3rd port.

The funny part about all of this - when I do speed tests, and my download speeds screech to a hault. my upload speeds are consistently in the 40-45Mbps range....

Thank you for the response by the way....

[EG]

If that is a 3-way *unbalanced* splitter, do you have the modem connected to the 3.5 dB port rather than the 7 dB port ?

[drbob2112]

That is correct.....

[drbob2112]

Just verified, the TV line is in the 7DB line and the internet is in the 3.5db line