Audio problems in Windows through sys-usb

I created a Windows 10 VM with Qubes-Windows-Tools and until now everything works pretty nice! With only one problem when i passthrough my soundcard and/or just a usb to 3,5 I am able to get sound but it just stops every once in a while. Sometimes every few seconds sometimes every 30 Seconds (Sound,Sound,Sound,Nothing,Sound,Sound,Sound;Nothing…).
What could be the problem behind this?