okay, this is driving me nuts. black screen, fans ramp up, and about five seconds later Windows comes back like nothing happened. then this pops up:

USB Audio Device Properties
Device status:
This device cannot start. (Code 10)
{Operation Failed}
The requested operation was unsuccessful.
It's always while scrubbing a 4K video timeline. My workstation is not overclocked and temps look normal in the vendor overlay. The only change I can point to is teh GeForce Graphics Driver update from NVIDIA. I've already restarted a dozen times, obviously. Is there a log somewhere that tells me what actually timed out, or am I stuck guessing?