>>370776393
I experienced this last night. 
It's due to being set to "programs" and having "Game mode" turned off in windows 11. 
Turn on game mode and it'll go away. 
Or, change performance to "Background Services" in the system app (right click start menu, click performance button) and you can leave game mode off. 
It's due to thread director not knowing how to handle multiple apps that need priority like vr does (and steamvr being a jerk and setting your power profile to high performance)