

Honestly, it does sound a bit like a hardware defect somewhere. Usually everything should work OOTB unless you are doing something really specific.
If you haven’t already done so, try updating the BIOS.
You mentioned the RAM being fine - have you run Memtest86+ for several hours? One pass is usually not enough to rule out memory malfunctions.
If you have a spare drive, try installing Linux Mint on it. If it still crashes, you can rule out Windows (and if it doesn’t, you could install a clean Windows on that same drive and try again).
You could also purchase a cheap AM4 motherboard (they start at like 60 bucks) to check if the issues still occur and refund it within the return window.
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