RBK753S - Xbox One X Causes Router to Reboot, Double NAT Detected Without Two Routers

RBK753S - Xbox One X Causes Router to Reboot, Double NAT Detected Without Two Routers
Hello,

I recently changed from the Orbi RBK53 to the Orbi RBK753S, and now I am having issues with my Xbox kicking all my devices off Wi-Fi and causing my whole system to reboot. I am have
no issues on any other devices, including my Nintendo Switch where I'm able to play online.

This is the setup I have:

Internet: Xfinity Gigabit Speed

Modem - CM1000 (this is a modem only, not a modem/router combo)

Router - RBR750

Game Systems - Xbox One X, Xbox One, Nintendo Switch

Cause: Going an Xbox Party Chat will cause my Router to reboot entirely, if I happen to get past that section, anyone joining my online game will cause a reboot. I can play the same
games connected online solo with no issues.

I have the latest firmware for my Orbi, and my Xbox One X has the most recent system update (7/14/2020)

My Xbox One X is wired to my RBR750, as is my Nintendo Switch. The other Xbox is wired to the RBS750.

I have UPnP On, IPv6 is turned on. Both are coming through on the Xbox.

I have done a tracert 8.8.8.8 and only the first hop is a private IP Address.

I have tried both Wired and Wireless, and even with one Xbox off. Additionally, I am getting a Double NAT Detected but I only have one router and my modem does not have any wireless capability.

The issue began occurring around 3 weeks ago, right around the time of the last update.

:)