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Seeing packet loss as soon as I use Xfinity's network - any ideas?

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Seeing packet loss as soon as I use Xfinity's network - any ideas?

Upgraded from 100 down to 300 down hoping that it would make WFH better for all of us in the house. I did not. I implemented QoS on the router, that helped tremendously, but I was still getting issues streaming, video calls, during gaming (felt like packet loss) - so I started to investigate.

 

Equipment:

  1. Modem - Arris SB6183 (3.0)
  2. Router - ASUS RC68U (Merlin firmware)
  3. DNS resvolver - local, hardwired
  4. Comptuers wired w/ Gigabit where testing is involved

    As you can see in the graph below - I am getting packet loss to the _very first Xfinity IP_ that I encounter as soon as I leave my own network. That tells me there's an issue on Xfinity's side, as there's no packet loss between my computers on the LAN.

     

    What can I do to resolve this?

     

    Things I've tried:

    1. Power cycled our WiFi router
    2. Power cycled our modem
    3. Called Xfinity, have them "re-provision the modem" - twice.
    4. Disabled QoS on the router (no difference in packet loss)

       

https://imgur.com/a/ZkaCSoy

 

<blockquote class="imgur-embed-pub" lang="en" data-id="a/ZkaCSoy" ><a href="//imgur.com/a/ZkaCSoy">xfinity packet loss</a></blockquote><script async src="//s.imgur.com/min/embed.js" charset="utf-8"></script>