Would be good to know what the rest of your rig is.
Had the same problem, sometimes there was still sound, but mostly it was just screens turning black and an instant reboot.
After changing GPU for another custom 5700 xt, changing PSU to a 750 platinum and every tweak I could find (updated Windows, GPU drivers, reinstall drivers without setting any profile when installing and many more), I contacted AMD and told them what my problem was.
For me, the solution was to change my memory. I have the 3800 xt which safely supports up to 3200 MHz, I was using 3600 MHz memory. After changing it in my bios to 3200 MHz, it was stable and the crashes were gone. I then changed to a 2x8 GB cl14 G.Skill Flare X (F4-3200C14D-16GFX) kit, got the timings a little tighter 14-14-13-28, so it was still safe according to DRAM Calculator for Ryzen. I even overclocked the GPU a little now, haven't had any problems since.
I hope that helps!
