Now and then video/sound stutters for about a second or two. I do have Hyper-V enabled and do use WSL2 (and docker, configured to use it), but in my case the issue does seem to happen when none of WSL2 VMs are running, so it's possible that it may be more of a Hyper-V issue than WSL2 itself.
I've managed to capture it with ETW trace. As far as I can tell, during this time, everything stalls for about 50ms, then resumes for 10ms and this cycle continues.
Absolutely no events get captured during the quiet periods. Here's one example: