Audio stuttering when Explorer is open on Windows 11

Strange problem with USB audio, Windows 11 and Explorer.

I use med laptop with Pioneer DDJ-800 controller. I also show video on 2nd screen and open Explorer to find a file and start it while using Rekordbox DJ software for the sound. Never been any problem and CPU and other resources are hardly used.

But suddenly a problem as appeared- When I open Window Explorer (or an open/save box) the sound starts to stutter (this is the sound output on the USB). Sounds terrible. But still minimal use of all resources.

If I close Explorer thing go back to normal again. Have trid running all other kind of sotware, but this only happeds with Explorer, and only when outputting the sound through USB to the DJ controller.

Why does Explorer mess the the USB audio?
And tips on how to fix this?

Started with no warning (might have been an update or something).