I wonder if this is related to your motherboard. I have an ASUS Zenith with a
1950X, 128GB RAM and a Vega 64 LC that have been on Kernel 4.20 through
5.0-rc4. The latter of which I'm currently on. I have no kernel parameters on
my grub file, only the default 'splash quiet'. I have never ran into hangs
while gaming, using youtube, OBS nor compiling the linux kernel. Just thought I
would share my similar configuration. I can only suggest try updating and or
downgrading your BIOS?