Crosshair VIII WI-FI X570, issue has been fixed among latest 3xxx BIOS versions.
However those are less stable with G.Skill GTZN DRAM 3600 MHz 1.35V. Thus back to version 2206, with that ugly FW bug, kernel can however boot and run.
That IRQ message can be muted. Just find and erase string in kernel source code and rebuild.