Zoom problems on Ubuntu 20.04

Hello everyone,

I really need your help.

I can not use the app on Ubuntu (20.04) properly anymore - the app keeps "loading the calendar" although there had been no such issue before the latest big update a couple of weeks ago. I simply can't access my meetings or start one, or anything.

I can't even see other's whiteboards when I join a meeting and they share it - other participants can see the whiteboard while on my computer it's forever "loading". I have to join meetings in browser and then transfer them to my app and I can only use my whiteboard in browser as well. It's very uncomfortable. Today, the app started freezing and crashing in the middle of a meeting and I have to rejoin and start all over again every 15 minutes or so.
Does anyone have an idea how to solve this?