I have been using both Microsoft Teams and Zoom for meetings and classes on a laptop running Lubuntu 20.04 since early 2021. Recently I have had an intermittent problem where I am in a meeting and try to access other online content (e.g. in a browser window) and can't. I have tried pinging another local machine using its dotted quad address, and it works perfectly; pinging, say, www.google.com nothing at all happens - eventually, if I wait long enough, I get an error saying there was a temporary dns failure; pinging 8.8.8.8 or 4.2.2.4 just gives 100% packet loss.
This happened in a Teams meeting today -- the meeting continues as normal, but nothing else online works, and as soon as the meeting is closed everything returns to normal -- ping works, browser works, etc.
Something like this also seems to be happening in Zoom, causing me to be unable to join breakout rooms without first quitting Zoom & logging out & back in again (reboot not usually needed).
Previous versions of Zoom and Teams have not caused this problem, but I update Ubuntu regularly when prompted.
OS Lubuntu 20.04.4 Kernel 5.4.0-100-generic
MS Teams 1.4.00.26453
Zoom 5.9.3 (1911)