I own a sapphire nitro+ rx 590 and i am having this shitty problems from the 1st month i built my pc. if i remember correctly some random restart triggered it. I tried everything with the software. New drivers, DDU, windows reinstall (no format) , mods, upscaling, downscaling, cmos reset- you name it. And i updated my bios 4 freakin times but nothing. i am using an amd apu and the problem persists even if i use the apu. I just searched the whole internet (!) and no solution!