I've noticed something similar. I have my power settings set to maximum performance with idling to sleep after 2 hours. When it does sleep, I lose my Nvidia HD audio. But it doesn't seem to be the NVidia card that causes the problem. When I go into the Control Panel, click on Sound it's my ViewSonic monitor that's off line (I'm feeding audio to both my monitor and my KRK monitors). Bringing the display back on line corrects the problem.
YMMV
Jeff
Win11, Intel i7 7700K 4.2Ghz, 32Gb RAM, 2x1Tb HD, 500Gb NVMe, BIAB/RB 2025, MOTU 828MK3 audio, MOTU Midi Express, Yamaha Montage 7, DX7II, TX802, Motif XS Rack, Roland Fantom XR Rack, Oberheim Matrix 1000, VoiceLive3 Extreme, Kontakt 6, SampleTank 4.3
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