Terribly Unstable Ping During Morning and Afternoon

I have been having terribly unstable latency for the past few weeks during school hours (around 9AM to 6PM on weekdays). It gets especially bad during the early afternoon around 1PM, but then is fine later at night around 8PM. Weekends are much better throughout the day. Even on weekdays during this past Winter Break, it was fine. The highly unstable ping and packet loss seems to only happen when local schools are in session. (I have 100MB/s download)

A few weeks ago, a tech came out to visit and found nothing wrong on my side (router, modem, signals, cables were all good), so he said he submitted a work order for the maintenance team to come. For a couple weeks now, the Xfinity Status Center has had a notice saying that my house has an outage, which I believe is because the work order was seen. Just last night, I checked the status center, and there was a new notice saying that the issue would be resolved at 10:44PM, but after 10:44PM last night, the notice changed to 1/5/21 at 2:35AM. The time has postponed several times now. As of the time of this post, it says it will be resolved at 1/5/21 at 5:55PM, which I honestly don't even believe is true. Please stop postponing and actually do something about this issue. This is getting very frustrating.

I have already tried connecting directly to the modem, but the unstable ping is still there.

I have also gotten a new modem, which didn't help either.

Here is some PingPlotter data from earlier today 1/5/21 around 1PM:

https://imgur.com/a/lJKHYSB

There is severe unstable ping and packet loss starting at the first local Comcast node 96.120.101.53. I should also not be getting average 100ms ping to my local Comcast node. There is clearly something wrong with the local Comcast infrastructure. Perhaps there is too much congestion during local school hours. Whatever the case is, please do something about it. I shouldn't have to worry about my voice getting indistinguishably choppy during crucial calls or classes.

According to the tech, there is nothing wrong on my end (modem signals are all good), so please send out the maintenance crew to check on the local infrastructure here ASAP. I can't do anything that requires consistent ping during the morning or afternoon. Voice calls and zoom classes sometimes get very choppy, and gaming is virtually impossible. This is getting very frustrating.