Intermittent Ridiculous Packet Loss

Hi, over the past couple of days, especially in the evening (yesterday it started around 8:30 PM and today around 10:00 PM,) I am getting a ton of packet loss.

The results are similar to other servers nearby. This issue is incredibly sporadic, making it extra annoying because every time I try to play an online game or use a VoIP program, it works for a while before taking a total nosedive and I'm nearly unable to load a website or even run a speed/ping test. My speeds are quite a bit less than what I'm supposed to be getting, but it's close enough that it doesn't really bother me.

I have had this problem before, but previously I was left with the impression that the packet loss was due to maintenance associated with a massive increase in bandwidth (given that they double speeds a couple of times over the last couple of years in my area.) This time, I'm seriously doubting that this is the case. I also would like to note that the techs that were sent out last time had no idea about the upgrade, and proceeded to blame my PC (nope), my modem (nope,) and then me (nope.) I used to work for an ISP. I know enough about what I'm talking about. Definitely more than 90% of techs that have been sent out to my place over the last couple of years.

My signal-to-noise ratios during the insane packet loss spouts are no different, and the issue persists over multiple devices and when I bypass my router. Unfortunately for me, I live in a small area where I have no other choice but Cox for internet service. I would happily pay 2x as much for 1/2 the speeds if it meant I had steady, reliable internet instead of this ** that renders my service all but useless at random. This is unacceptable. What can I do?