After updating to 19.12.2 i am noticing Doom has a tendency to crash when ALT + TAB is used on the Vulkan API. The games also stops responding randomly after loading maps or during boot. I haven't had this on older drivers.
I'm going to try updating Crimson to 19.12.3 to see if it helps, but just wanted to give an heads up.
I haven't tested other games using Vulkan , it's this game where it happens so i have to use OpenGL 4.3 for a stable game for now.