Liberty Air 2 randomly unselected as audio output in Zoom

Just got a pair of Liberty Air 2 and I use a Microsoft Surface Book 2. When in a Zoom session for a few minutes, the LA2 gets de-selected as my audio output device and I just get silence until I cycle through the output devices in Zoom’s settings and then I get output again through the LA2.

Is this a known issue and is there some sort of firmware update or something that might help? Otherwise I’m happy with them but its going to turn out to be a dealbreaker if it continues.