Teams calls disconnect when on video or sharing content.

I'm experiencing ongoing issues with my internet connection during Microsoft Teams calls. Repro steps:

1. Go on Teams call and turn on camera, and it breaks the Internet connection to my laptop. With or without VPN. Wired and Wireless connection to the gateway. I've tried all the ways.
2. Same exact experience with camera turned off and sharing content.

I've followed the troubleshooting steps multiple times, including restarting the modem, gateway, and laptop, and clearing cache for Teams. It happens both on and off VPN, and the problem doesn't occur when I'm on another provider's network while out of town. My cellphone hotspot works great on Verizon, but I'm 1 foot from my Xfinity gateway on a wired connection with wireless failover and it cuts off the Internet connection 100% of the time.