The problem is still persistent with Vega (56&64) , now I´ve installed an RX590 Nitro+ and the sound issue is dissapeared again.
@AMD Driver Team, please check this issue, I guess that is an incompatibility between newer drivers and Vega.
The Windows release driver (17.7.1, fresh Windows installation) do not have this problem but all other installable drivers on Windows 10 x64 (newest build), at least on my system.
Short quote of my System:
Ryzen 1700
MSI B450 Pro-M2
Sapphire Radeon Vega Liquid Cooled
Newest Driver (Adrenalin 19.2.2) and BIOS from MSI
Windows 10 x64 ( Build 1809 )
Please investigate, Thanks!