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Unstable Internet connection... Local or something else?

It started a few days ago especially just the last few hours when the outdoor weather temperature got into the mid 80s(F) degrees in So. CA. However, last Monday had an over four hours outage because of an urgent utility wood pole replacement down the hill. After they were done and both power and cable services came back, cable services (TV, Internet, and phone) were fine after it until last Friday when I noticed random disconnections, lags, etc. with Internet. TV seems fine too. Phone, no idea since it is rarely used. I already tried manually rebooting the cable modem with its hole button method last night.

 

https://imgur.com/a/ZUk3AsP for the signals during the earlier disconnections when things got really bad. Things seem to be calm for now, but I have a bad feeling they will be back again. From what I read, these downstream numbers are OK from https://forums.timewarnercable.com/t5/Connectivity/FYI-basics-of-signal-power-level/td-p/116692 and https://www.dslreports.com/faq/11987? IIRC, the numbers used to be closer to zero?

 

Event logs:

 DOCSIS(CM) Events

+------------------------------------------------------------------------------------------------------------+
|Date Time|Event ID|Event|                                    Description                                    |
|         |        |Level|                                                                                   |
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|84020200|  5  |Lost MDD                                                                           |
|  13:20  |        |     |Timeout;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0; |
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|82000200|  3  |No Ranging Response received - T3                                                  |
|  13:20  |        |     |time-out;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0;|
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|84020200|  5  |Lost MDD                                                                           |
|  13:20  |        |     |Timeout;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0; |
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|82000200|  3  |No Ranging Response received - T3                                                  |
|  13:20  |        |     |time-out;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0;|
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|84020200|  5  |Lost MDD                                                                           |
|  13:20  |        |     |Timeout;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0; |
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|82000200|  3  |No Ranging Response received - T3                                                  |
|  13:20  |        |     |time-out;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0;|
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|84000500|  3  |SYNC Timing Synchronization failure - Loss of                                      |
|  13:21  |        |     |Sync;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0;    |
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|82000200|  3  |No Ranging Response received - T3                                                  |
|  13:21  |        |     |time-out;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0;|
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|84020200|  5  |Lost MDD                                                                           |
|  13:25  |        |     |Timeout;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0; |
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|82000200|  3  |No Ranging Response received - T3                                                  |
|  13:25  |        |     |time-out;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0;|
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|84020200|  5  |Lost MDD                                                                           |
|  13:26  |        |     |Timeout;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0; |
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|82000200|  3  |No Ranging Response received - T3                                                  |
|  13:27  |        |     |time-out;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0;|
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|84000500|  3  |SYNC Timing Synchronization failure - Loss of                                      |
|  13:28  |        |     |Sync;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0;    |
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|84020200|  5  |Lost MDD                                                                           |
|  13:28  |        |     |Timeout;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0; |
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|82000200|  3  |No Ranging Response received - T3                                                  |
|  13:28  |        |     |time-out;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0;|
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|84020200|  5  |Lost MDD                                                                           |
|  13:29  |        |     |Timeout;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0; |
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|82000200|  3  |No Ranging Response received - T3                                                  |
|  13:31  |        |     |time-out;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0;|
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|84020200|  5  |Lost MDD                                                                           |
|  13:34  |        |     |Timeout;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0; |
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|82000200|  3  |No Ranging Response received - T3                                                  |
|  13:34  |        |     |time-out;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0;|
|---------+--------+-----+-----------------------------------------------------------------------------------|
|3/17/2019|84020200|  5  |Lost MDD                                                                           |
|  13:36  |        |     |Timeout;CM-MAC=40:xx:xx:xx:xx:b2;CMTS-MAC=00:xx:xx:xx:xx:6f;CM-QOS=1.1;CM-VER=3.0; |
+------------------------------------------------------------------------------------------------------------+

What do you guys think?

1 REPLY 1
Highlighted
Established Sharer

Re: Unstable Internet connection... Local or something else?

If your current downstream levels are similar to what you show in the Imgur link, it's not good, as the Imgur link shows 525MHz as "dead", 531MHz as "not good" (high correcteds, low SNR), and then everything else is "OK, but not really good SNR numbers".  The missing upstream channels in the 2nd and 3rd signal checks are also a bad sign.

 

Couple that with the number of T3 errors you're seeing in a short period of time (14 minutes), and I'd say that you probably have a problem worth investigating.  Of course, you might have a tough time lighting a fire under Spectrum over it, since it's not "completely in the toilet".

 

I wouldn't block out the CMTS-MAC address if I was posting this sort of information, while it could be used to pin you down to a fairly large area, if you have any smartphone or tablet cellular service, someone who wants to track you down can get much better granularity on your location in near real-time (and cheaply, too).