I just threw away the teams client and use the web client in chrome for the moment. No problems anymore so far (and teams is faster / uses less CPU)
I heard there’s a complete teams redesign ongoing. I’ll wait for that.
(AND the current teams web has more features that the rather old linux client)
According to the toolchain thread,
https://forum.endeavouros.com/t/toolchain-updates/24139/11
the problem causing all the rukus has been solved.
Thankyou for the link @joekamprad
and everyone else’s replies
Just got done rebooting this machine and everything back to normal it seems.
Now to update the other 3 machines.