DOCSIS 3.1 Downstream Dropping, Event Type Codes 20 and 22

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@spookytoast wrote;

From what I've found searching, my downstream power is a little low and upstream is a little high. 

Yes. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

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 !

An update on what's happened so far:

I was able to start a chat with the Xfinity support team and get a tech visit scheduled same day.  The tech came out and checked the levels at my modem as well as coming from the pole.  He was very courteous and listened to everything I was telling him.  After taking the levels and re-terminating a couple of my unused lines, he said there was nothing really wrong internally he could see and that the power level coming from the pole was a little low (however not enough in his opinion to cause serious issues).  He also noticed that there must be some upgrading going on because I gained an upstream channel between my first post and the day he was out.  The tech said he would put in a ticket to the network team to look at the closest node, as there was also some component inside which was able to move but shouldn't be. 

The next day, I got a follow up call from Xfinity support because I had responded to their survey that my issue had not been corrected.  I told them the tech did a great job, but was unable to find anything to fix and that there should be a ticket in with the network team.  The support agent said he would follow up with the network team to make sure it was being worked.

The day after, there was network outage for an hour or two (a friend about 5 miles away was also down).  Since then, I had been seeing slightly better downstream power levels (-7dB instead of -9dB) and my DOCSIS 3.1 light was staying on...until today.  After 4 days of no errors, this afternoon I lost my DOCSIS 3.1 connection and I see two sets of event code 20/22 errors in my log.

So it looks like things are still currently unchanged and, according to the tech, I'm at the mercy of Xfinity raising power levels.  I'm hoping the network team still has to look at the node and that the outage earlier wasn't their attempt to fix things.