The issue I am facing with my 9320 (maybe related) is that everytime Windows Plays its sounds (alerts, notifications...) it "locks" the sound card. Discovered when adjusting volume using taskbar (it plays a Windows Sound when you do so). No other application can use Sound since (even Edge with Youtube video but no sound). That is what I thing is the trigger. Work around: No Windows Sounds.
Since getting the XPS Plus I've had no end of sound issues. I can go to the volume control and adjust that and hear the system sounds fine, however, if I open a youtube video I get no sound but the video plays. If I then go into audio settings and find the option for "Audio enhancements" turn that off then back on again it then magically starts working.  This seems to be a constant battle as I can then close youtube and do some work and reopen it later to play something and again the sound has gone, or quite often it'll even fail to load the video and eventually display a message about being unable to render audio. tempted to return this and go back to another brand as this is the first time I've ever had a laptop with sound issues like this. All my drivers are up to date, I've installed nothing that would cause this issue.Running the latest version of windows 11. Is there a solution to this?     
XPS 13 Plus Sound issues