my specs:
ryzen 5 1500x
xfx rx580 gts black 8gb
msi x370 krait gaming
8gb crucial 2400mhz
Corsair cx750
this problem only started when i got an lg 34uc79 freesync monitor.
i tried to see what caused this problem so i ran the witcher 3 with msi afterburner in the background.
then i noticed something.
when the gpu uses more than 130w the screen goes black for 1 or 2 second every now then.
i tried reinstalling gpu drivers
i tried reinstalling the graphics card
i tried a different psu
i tried to use hdmi instead of displayport
still no fix