Intermittent connection drops & poor cable connection quality

My home internet has been randomly disconnecting, sometimes multiple times per day, for a few months now.  Disconnects are brief, but my spouse and I both work from home and pay for the connection speed to support our devices.

Full history:

I have replaced my cable modem, my gateway router, and had two technicians dispatched to my house.  Every time, some of the problem is alleviated, but has not been eliminated.  The original service drops would knock my home network devices offline for extended periods until the original Comcast modem was unplugged for several minutes before reconnecting.  After that was replaced with a Netgear modem, I was able to see there was horrible signal quality across more than half of my downstream channels, and had a tech out- he tested the line at demarc, found heavy signal noise, and replaced some components outside the house but said an engineer team would have to be dispatched to find where the rest of the problem was.  Less than a week later, my downstream channels were within spec, but I still had upstream channels too high.  Around a month later my gateway router started becoming unresponsive- when my network would drop, I would be unable to access its browser control portal until manual power cycle- the modem would not need a reset during these events.  We replaced the gateway router, and now when we lost Internet, I could still browse to the router and modem, but the modem diagnostics still showed bad signal quality upstream.  We called support again and had the second tech visit, where they again found heavy signal noise just from where the line entered the house- he didn't even have to get to demarc to find a bad line.  That tech had a lift truck dispatched out and they replaced a junction at my telephone pole.  A few days later, it dropped again, and now the frequency is sometimes days apart- at least that we notice.  The modem still shows poor upstream power levels and reads the line as running in partial service mode.

This service has been rock solid for over a decade until a few months ago when this started.

Images from my modem's diagnostics:

Recent event log:

[Image Removed: "Personal Information - MAC Addresses"]

If there is other information that would be helpful, I will provide what I can to resolve this.  Our dropped calls at work are starting to be noticed.