CM1000v2 Xfinity losing connection intermittently, dropping to 0.1mbps.

[SeasonedZB]

Hey all, I've been having some issues with Xfinity internet recently. I'm paying for the 600mbps internet, however on a good day I'd be lucky to get 100. Every hour or so (sometimes even multiple times an hour) the internet speeds will drop to 1mbps and then slowly deteriorate down to 0.1mbps before stopping entirely. I suspect it has something to do with the wiring outside my home, as the wires have been here since I moved in 20 years ago. It seems like the downstream power is quite low, and the high number of uncorrected codewords concern me but I'm not too knowledgable in this area. I have a tech coming in to check it out for the third time, but I wanted to have someone on here look over the logs and give me some more info in case the tech tries to blame it on my hardware and leaving without fixing anything again. Would appreciate any help or info on what could be the cause. Modem is brand new, tried to swap it out with a different one to make sure the modem wasn't faulty, but the problem still persists. Thanks in advance! 

<tabindex=-1>Startup Procedure</tabindex=-1>

Procedure Status Comment Acquire Downstream Channel 573000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enable BPI+ IP Provisioning Mode Honor MDD IPv6 only

<tabindex=-1>Downstream Bonded Channels (Partial Service)</tabindex=-1>

Channel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords 1 Locked QAM256 28 573000000 Hz -18.9 dBmV 34.8 dB 2499374975 250 159 2 Locked QAM256 1 405000000 Hz -14.5 dBmV 39.3 dB 2597809286 1302 572 3 Locked QAM256 2 411000000 Hz -15.0 dBmV 38.8 dB 2597813296 1350 971 4 Locked QAM256 3 417000000 Hz -15.5 dBmV 38.4 dB 2597816396 1476 852 5 Locked QAM256 4 423000000 Hz -16.3 dBmV 37.6 dB 2597818486 1787 2661 6 Locked QAM256 5 429000000 Hz -15.8 dBmV 38.0 dB 2597822300 1728 2421 7 Locked QAM256 6 435000000 Hz -15.4 dBmV 38.5 dB 2597827611 1744 1574 8 Locked QAM256 7 441000000 Hz -15.5 dBmV 37.5 dB 2597829374 1647 1094 9 Locked QAM256 8 447000000 Hz -16.4 dBmV 37.6 dB 2597836879 1411 910 10 Locked QAM256 9 453000000 Hz -16.2 dBmV 37.6 dB 2597837832 789 2041 11 Locked QAM256 10 459000000 Hz -16.0 dBmV 38.0 dB 2597845183 1232 3321 12 Locked QAM256 11 465000000 Hz -16.0 dBmV 37.9 dB 2597847109 1062 3304 13 Locked QAM256 12 471000000 Hz -16.3 dBmV 37.6 dB 2597850070 810 2020 14 Locked QAM256 13 477000000 Hz -16.6 dBmV 37.1 dB 2597853879 1015 2925 15 Locked QAM256 14 483000000 Hz -16.7 dBmV 37.3 dB 2597860566 1809 2928 16 Locked QAM256 15 489000000 Hz -17.5 dBmV 36.4 dB 2597863114 2775 3084 17 Locked QAM256 16 495000000 Hz -18.6 dBmV 28.5 dB 2363210201 108132094 15024274 18 Locked QAM256 17 507000000 Hz -17.2 dBmV 31.5 dB 2153678426 289027215 19536160 19 Locked QAM256 18 513000000 Hz -16.6 dBmV 28.6 dB 2479340257 19328495 21055 20 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 21 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 22 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0 23 Locked QAM256 22 537000000 Hz -17.2 dBmV 29.8 dB 1424587511 382285863 125215586 24 Locked QAM256 23 543000000 Hz -17.6 dBmV 29.8 dB 2574275698 23395038 193657 25 Locked QAM256 24 549000000 Hz -18.2 dBmV 34.3 dB 2597880302 2071 4606 26 Locked QAM256 25 555000000 Hz -18.5 dBmV 34.6 dB 2597883523 2054 4219 27 Locked QAM256 26 561000000 Hz -18.7 dBmV 35.2 dB 2597890004 3123 1420 28 Locked QAM256 27 567000000 Hz -18.8 dBmV 35.1 dB 2597893714 1556 4001 29 Locked QAM256 29 579000000 Hz -19.3 dBmV 34.4 dB 2597896299 1292 3632 30 Locked QAM256 30 585000000 Hz -20.1 dBmV 28.6 dB 2588580571 9148930 160596 31 Locked QAM256 31 591000000 Hz -20.0 dBmV 29.5 dB 988959817 417617736 149592136 32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>

Channel Lock Status Modulation Channel ID Frequency Power 1 Locked ATDMA 1 35600000 Hz 50.3 dBmV 2 Locked ATDMA 2 29200000 Hz 49.8 dBmV 3 Locked ATDMA 3 22800000 Hz 48.3 dBmV 4 Locked ATDMA 4 16400000 Hz 47.8 dBmV 5 Not Locked Unknown 0 0 Hz 0.0 dBmV 6 Not Locked Unknown 0 0 Hz 0.0 dBmV 7 Not Locked Unknown 0 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 0 Hz 0.0 dBmV

<tabindex=-1>Downstream OFDM Channels</tabindex=-1>

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, 1 193 722000000 Hz -28.4 dBmV 19.3 dB 1108 ~ 2987 46506971 4722917 41784054 2 Not Locked 0 0 0 Hz -10.4 dBmV 0.0 dB 0 ~ 4095 0 0 0

<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>

Channel Lock Status Modulation / Profile ID Channel ID Frequency Power 1 Not Locked Unknown 0 0 Hz 0 dBmV 2 Not Locked Unknown 0 0 Hz 0 dBmV

[FURRYe38]

So your power levels are out of spec:

https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router?  

The correct and un-correctables should be zeros.

Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box. 
Be sure your using good quality RG6 coax cable up to the modem. 
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Mod...
article=24311https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html