I upgraded to 18.12.2 for my RX 580 on my up to date Windows 10 Pro gaming rig.
Problem 1 - High Definition Audio Bus install asking for reboot in notifications.
Problem 2 - Installs every time I reboot.
Problem 3 - No sound behind me in games on my 2.1 Stereo Speakers+Sub.
Downgraded to 18.5.1 and all three issues went away. Fix your drivers please!!!!