I have the same issue and have tried your solution.
However, i'm still not sure that everything is correct. Here a screenshot of my device manager. Should there really be two audio devices like it is there?
Can this cause some of this problems?
I have updated to latest bios, then uninstalled all previous graphics/audio drivers and finally Installed the latest graphics drivers. Still getting the problem that there is no sound untill the NUC get's rebooted if the Yamaha V773 receiver has been turned off for a while.