Losing internet connection every night around 10:00 PM due to low signal strength

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After 10:00 PM Strength (after reboot required to reconnect)
Downstream bonded channels 1 - 16 Locked QAM256, only one upstream channel
Channel/Pwr(dBmV)
   1   -2.8
   2   -3.1
   3   -3.0
   4   -3.1
   5   -3.4
   6   -3.7
   7   -3.8
   8   -4.2
   9   -4.3
  10   -4.6
  11   -4.8
  12   -5.0
  13   -5.2
  14   -5.5
  15   -5.6
  16   -5.8

Nominal Daytime Strength (no reboot)
Downstream bonded channels 1 - 16 Locked QAM256 four locked upstream channels
Channel/Pwr(dBmV)
   1    2.4
   2    2.6
   3    2.7
   4    2.9
   5    3.0
   6    3.1
   7    3.3
   8    3.3
   9    3.4
  10   3.2
  11   3.3
  12   3.3
  13   3.3
  14   3.3
  15   3.5
  16   3.3

A reboot is necessary to re-acquire the other three upstream channels.

Event Log:

 Sat Oct 30 00:17:17 2021    Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.0;CM-VER=3.0; 
 Sat Oct 30 00:19:09 2021    Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.0;CM-VER=3.0; 
 Sat Oct 30 00:20:22 2021    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.0;CM-VER=3.0; 
 Sat Oct 30 00:34:42 2021    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0; 
 Sat Oct 30 02:32:38 2021    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0; 
 Sat Oct 30 02:46:51 2021    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0; 
 Sun Oct 31 04:44:45 2021    Critical (3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0; 
 Sun Oct 31 04:49:05 2021    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0; 
 Time Not Established   Notice (6)   Honoring MDD; IP provisioning mode = IPv6 

In an 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 5-1000 MHz, bi-directional, and no gold colored garbage from Radio Shack, Home Depot, Target, etc. Splitters should be swapped with known to be good / new ones to test.

Also check the coax cable for any damage such as cuts, nicks, kinks, sharp bends, etc.

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.

Good luck with it !

The drop from the utility pole to my house was completely replaced/upgraded in July 2019, complete with a weather-tight box mounted to the wall and bonded to the electrical ground for the electric meter and my breaker panel.  There is no splitter of any kind, anywhere.  I have internet only, no TV.  The cable from the box, through the wall and connected to my modem is one piece installed by an Xfinity tech.

The issue with getting a tech to investigate is that the signal is very strong during the day when techs visit.  I'm losing my connectivity at night, almost every night around ten, and the signal strengths in my previous post are typical.  The problem is  not on my end, it is transmission line signal degradation somewhere (or several somewheres) along the miles between my home and the transmission input.

Also, something somewhere along the transmission line is not completely weather=tight, because I typically lose connectivity when it rains here and/or north of here.  My transmission lines come into town from the north.

The last time a tech was here, he didn't even come in the house.  He connected his meter to the incoming cable and said, "I wish I could get this good a signal everywhere."  I told him the signal strength my modem was showing, he nodded, I told him that my connection was fine, and he got back in his truck and left.

My problem is that it happens almost every night, and it is not my equipment, it's the degraded signal strength in the late evening.  There's nothing that a tech visit could solve.

Your only recourse is to get the techs involved again. Show them this thread.

Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home.

Keep leaning on them to escalate this issue up the chain. Get supervisors involved ! Good luck !

I don't want to pay a service fee for a problem that is not my problem.  As I said, there is no problem when the tech comes during normal business hours, so there is not a problem to escalate.  The tech finds no problem.  I've been told before that the problem would be escalated based on my complaints, but those have gone nowhere/done nothing to fix the late night connection loss.

I want to break out of that circle and get something resolved, but the problem is not here, and calling the helpline only gets a tech to come out and discover that there is no problem.

I've been in a more-or-less open chat with Xfinity reps since my last post here, and my issue has yet to be resolved.  It has gotten worse.  Every tech that they have sent to my home has said the same thing; it's a problem with the transmission line/equipment, it's not a problem on my end.  A maintenance ticket was put in on the last visit, but the issue persists.  Last night was the worst yet, with seven drops, each requiring multiple reboots of my modem to get the internet back.  Another tech is scheduled for tomorrow, same song, different verse.  If I had a viable broadband alternative to Xfinity, I would jump on it in a heartbeat.

A tech and his supervisor showed up a little after 10:00 this morning (the appointment was scheduled by one of the techs on this forum).  The upstream channels (checked at the tap on the pole) were unbalanced, as usual.  The tech also checked the other taps on the pole, and saw unbalanced upstream channels on them, as well.  The supervisor elected to run a new drop from the tap to my house, just to eliminate that as a possibility.
He also spoke on the phone at length with the maintenance supervisor responsible for this area, put in a maintenance ticket, and requested that the channels get balanced today.  About 4:35 this afternoon, a maintenance tech in a bucket truck knocked on my door.  He said that he was pretty sure that he had fixed my problem.  He found an amplifier with a lot of water inside the case about four blocks from my house, and replaced it.  He said it was affecting the whole area, and after he replaced it he got the channels balanced.
He had the amplifier on his truck and showed it to me, and the evidence of water was clearly visible on the inside of the case.  He said that he had started to do his balancing at the amplifier closest to me but had no success.  He went to the next amplifier up the line, and when he opened the case, water poured out.  He replaced that amplifier, did his balancing there, then went back to the first amplifier, and completed his balancing.
A month ago I said, "Also, something somewhere along the transmission line is not completely weather-tight, because I typically lose connectivity when it rains here and/or north of here."  It would appear I was correct.
The main issue I have with Xfinity in this case (and probably for others as well) is that there is a strict criteria for signal degradation measurements to get maintenance involved in transmission line work.  My degradation was a point or two (every time a tech would check) below that criteria, and even though a maintenance ticket had been put in on November 11, the supervisor that was here today said that in his research of my issue he couldn't find where any maintenance work had been done on that ticket.

I will have an update tonight.

Last night I streamed a Netflix movie, watched some YouTube videos, and was online until a little after midnight.  No internet issues occurred.  Signal strength was low, but not nearly as low as it has usually been for the last couple of months, and the spread over the 16 downstream channels was narrow, less than a difference of 1 between the lowest and highest.  The upstream channels were perfectly balanced, although a bit high, but not out of acceptable parameters.  Last night was the first night in a couple of months that I did not lose the internet even once.

All the techs and front line supervisors with whom I've come in contact have been very knowledgeable and professional.  I stated my main issue with Xfinity in my previous post, so I won't repeat it here.  But, again, last night was a good night.  Thanks to the techs (both here online and those on my end) for all the help, cooperation and sticking with me through this.  If the problem shows itself again, I'll be back.