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Ryzen 9 3900X compatible motherboard recommendations?
(lemmy.dbzer0.com)
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Rules:
Before buying a new mobo, I hope you'll reset the BIOS settings to safe defaults and see if that clears any problems.
If you do end up buying a new one, I suggest one that supports ECC RAM. (I think Asus officially and Asrock unofficially support ECC, but I haven't kept up on available options in a year or two.)
Edit: Also, I hope you haven't overlooked power supply failure as a possibility. Some people forget that component, or don't realize what weird problems can come from it being underpowered.