I suspect I have a similar problem with my WH-1000XM4, the wifi hotspot on my Pixel 4a. Whenever I was listening to music from my phone connected while also using it as a hotspot for the laptop I would start losing tons of packets and couldn't reliably connect to a work VPN, and turning the headphones off would fix those issues. I'm not sure if it was interference or if they share the same antenna on the phone or something like that though.