System Specifications:
MOBO: ASUS ROG Strix X570-I
CPU: AMD Ryzen 7 3700X
GPU: EVGA GTX 1060 SC (6GB)
Memory: Corsair 32GB DDR4 Vengeance LPX 3200MHz
Storage: 1TB Samsung 970 EVO Plus
PSU: Corsair SF750 Platinum (750W)
My X570 motherboard was previously on BIOS Version 2203, which was completely stable and fine. However I decided to update to BIOS Version 2606 in preparation of Zen 3. After this update, my PC would randomly hard reboot in the range of a couple of seconds to five minutes. I tried to revert back to BIOS Version 2203, however I was unable to do so. I believe this is due to the fact that the new BIOS contained "AMD AM4 AGESA combo V2."
ASUS recently released BIOS Version 2802, so I updated to that hoping that it would fix the hard rebooting issue. It didn't.
I've found a temporary fix, in which if I switch off the PSU and hold the power button for a minute, it would cause the PC to not randomly reboot. However if I normally turn off the PC after doing this procedure and turn it back on, it will eventually hard reboot.
I'm unsure in terms of what to do really. I honestly don't believe it's due to my components, as this issue has literally only occurred after updating my BIOS, but I also can't rule out the possibility.