The audio issue occur when view Desktop with SteamVR (not Oculus Dash Desktop viewer).
Sometimes suddenly audio stop in VR games (run on SteamVR) without Desktop Viewing too.
The audio came back after disable and re-enable the Rift audio, but problem will return.
This issue didn't occur with vega56.
Oculus software ver.1.39.1
Radeon software ver.19.7.1 ~ 8.1 all tested
I found audio Valve Index audio issue has fixed Radeon software ver.19.7.2,
Is there any problem between Radeon software (or Graphics card) and OpenVR...?