Issue when sharing screen, I get internet connection is unstable. I have symmetrical gig service, devices connected via ethernet

This issue has me banging my head against a wall. I have cox internet in AZ with the service 1 gig up/down (with speedtests showing 920’ish both ways). I have unifi equipment and all affected devices are hard wired. The issue occurs on my wife’s and I laptop. When we join a zoom meeting everything is fine. But once we share screen, we get internet connection is unstable and from the other users in the meeting they report our voices are robotic or don’t transmit at all. they also report the stream lags extremely bad or freezes. This issue does not happen when using teams or any other meeting software. All other devices/services work perfectly fine in my environment. 

To troubleshoot I have plugged my laptop directly into the modem, bypassing my router, and the issue still occurs. I had a cox technician here this morning and he basically shrugged his shoulders. I know something is being blocked upstream and I need to be able to go to cox with this evidence. Has anyone here experienced this issue? Is anyone able to help?