This is the way to consistently replicate this problem:
1. Open 2 browser tabs (no matter what browser)
2. Connect to MS Teams on each tab (no matter what section in MS Teams).
So far so good - you can use them and go back and forth between them with no problem.
3. Add a third browser tab and connect to MS Teams.
The issue comes when you add a third browser tab with MS Teams. You can use the third tab with no problem but as soon as you go to any of the first two tabs you will get the "Are you still there?" popup. It wouldn't matter if you just had to press the button
and keep going, but the issue is that it fully refreshes the web page, taking about 10 seconds and losing it's position.
Opening browser windows instead of tabs makes no difference.