Dealing with some weird resets with my new (H12SSL-NT brand new, used China EPYC 7642) system too. Ran fine all day yesterday, turned it off for the night, resets before ESXi finishes booting. (In fact sometimes it just resets during PCI enumeration postcode 94)
E: I noticed that a ping to the BMC (on the 10G NIC) timeouts when this happens, but it doesn't always happen.
E2: I suspect a bad NVMe cable (SlimSAS to 2x OCuLink), as the crash occurs much more frequently with one of the two OCuLinks
E3: still occurring. this is driving me nuts. I've contacted SM supports but it's a weekend so