It's believed to be a fault with the Ryzen chips, though don't believe AMD ever officially addressed it (although they were RMAing them repeatedly for hte issue). I sent it back a couple of times for replacements but the lottery wasn't in my favour, and although the one I ended up with is better, it's not perfect;
I was an early adopter, and I accept that but it still left a bitter taste none the less, and ultimately it just meant that my pretty expensive computer barely got used because I hated dealing with it (still have it but barely boot it these days).
