Simple, WHEA errors are nearly always hardware related and most likely CPU.
I had these as well, after I recently upgraded to a 5700X. Symptoms were reproducable, with WHEA criticals in Event Log, reproducable application crashes (HWiFO crashing) and intermittent hard reboots when idle.
A full week of testing every cpu and memory related bios setting concluded it was the cpu.
Started RMA procedure with the store where I bought it and the replacement 5700X fixed all the issues!
Is your memory kit on ASUS's QLV list of supported memory modules by your motherboard? This should not always be an issue. My kit is not on my mobo's QLV list.
1) test your memory kit, with disabled PBO and c-states.
Run MEMTEST86 fully in the night, with first XMP off and then test with XMP on.
If this both tests out without errors, then go to point 2.
If you had errors here, then I suspect memory compatibility. In any case also test point 2.
2) disable "Core Performance Boost". Cpu now is limited to max base clock of 3,8Ghz and cannot boost.
IF your system becomes fully stable with THIS disabled? Then I am 100% certain you have 'a' defect somewhere in your 5800X3D.
Point 2 in my opinion is a very important metric if disabling that makes you system stable. I would then RMA the cpu with the store where you bought it and request a new replacement cpu.
Hope this helps.
