MDD message timeouts and packet loss, ongoing issue.

This is an ongoing issue since October, I'd strongly urge everyone to read through the post carefully to know what trouble shooting steps have already been taken. I'd also like to make it clear that I had no issues with my service prior to October. 

To summarize, this last October I began noticing issues with my upstream, the connection was unstable and showed signs of major packetloss. I took the usual troubleshooting steps like power cycling the modem and directly connecting to it, but to no avail. I also around this time contacted an xfinity agent through the app, wanting to know if they saw any issues from their end. Of the few agents I spoke with, one of them told me about some kind of maintenance going on that was causing the issue. This maintenance wasn't one of the usually scheduled ones, didn't appear on the app, and every other agent I spoke with said there wasn't any maintenance. Keep this in mind for later. I also made a post on these forums asking for assistance and posting my modem's logs. The event logs had a lot T3 timeouts as well as "Dynamic Range Window violations", it was also pointed out to me that my upstream power levels were out of spec and that I'd most likely need a technician to come out.

The first technician was very helpful, he checked all the lines both inside and outside, as well as all the fittings at the splitter. He explained things every step of the way and told us that it was most likely an issue with the line from our house to the tap. The technician ordered a crew to come out and put in a new line and said that the crews probably wouldn't connect the new line and that we'd need to have another technician come up to hook it up and check everything. A few weeks later the line crews came out and buried the new line, and apparently also connected it. This wasn't communicated to us however as they only told us our service would be out for a short time and asked before they left if we had service. Not knowing whether the new line was connected and still seeing issues we scheduled a second technician to come out.

The second technician was unfortunately far less helpful, he barely said a word and didn't really address any of our concerns. He did check the new line and confirmed it was connected, as well as checking the signal strength but didn't share if it was good or bad. He rechecked the fittings at the splitter and switched the modem to a different coaxial cable that ran to the splitter. Over all it seemed like he was rushing to get out of here, but one helpful thing he did mention was ongoing maintenance. He didn't specify anything about the maintenance other than a brief mention though. After his visit the T3 timeouts and "Dynamic Range Window violations" were no longer present and my power levels are within spec again, but I was still seeing issues with the upstream.

I should mention that throughout all of this, only the upstream had been effected. The downstream was completely stable and had no problems as far as I could tell. However within the last week or so I've begun noticing downstream issues, webpages loading slowly, high downstream packet loss, videos and streams buffering not playing correctly. This is all on top of my continuing upstream issues. All of my power levels seem to be in spec for both up and down, however I'm now receiving a ton of "MDD message timeouts" in the modem's event log. At this point I'm honestly not even sure what the issue could be on my end since we've checked and changed everything. There have been days since the previous technician visit where even the upstream is completely stable, but others where its not and now the downstream also seems to be acting up.

Earlier I mentioned being told about some kind of maintenance by both a chat agent and the second technician with no specifics, I highlighted this since I work nights and I assume that's when this maintenance is taking place as most of my connection issues seem to clear up by 11am in the morning. The issue I have though is this maintenance hasn't been communicated in any official way and I've even had xfinity agents flat out tell me there was no maintenance or that they don't know what I'm talking about. I obviously don't know for sure if this maintenance is the cause of my problems and it could very well be something else, but after having two technicians come out and check things I'm not sure what else it could be at least on my end. Below I'll post my modem power levels and logs, any help with this would be appreciated