Open administrator cmd prompt and enter
net stop NvContainerLocalSystem & net start NvContainerLocalSystem
via https://www.nvidia.com/en-us/geforce/forums/gamestream/19/297021/how-do-i-get-my-audio-back-on-pc-after-a-game-stre/
https://github.com/moonlight-stream/moonlight-qt/issues/199
