Issues with users not able to see everyone on gallery view, hear the speaker, & more

[Carolyne_M]

I run meetings with 50+ people. We've had several people experience this same issue. When they are in the main room in the Gallery, they see fewer people on the screen than there are, they can't hear the speaker, and they can't see prompts when they are in the breakout room. 

They are pressing yes when prompted to about being recorded and have uninstalled and reinstalled zoom.

This issue has been going on for a month. Anyone else experiencing this? Any suggestions on how to fix it?