I recently bought a RX 570 (Gigabyte model), at first I noticed when I run some games the screen goes black for about 2 seconds and then comes back. I made a post here about it and I was told it was the power supply, so I figured it was because it used a very bad 500W model, I bought a new power supply (PC YES Electro V2 500W 80Plus). After installation I went to test and realized that the problem continued, in some games this happens EX: ARK, Tomb Raider ... But the funniest thing is that running the Stress GPU (Furmark) It doesn't happen that the screen flashes, it doesn't make sense, in furmark it uses the 100% GPU at 75ºC and it doesn't happen, but in games it does.
CPU: Pentium G4560
RAM: 8GB 2400Mhz
GPU: RX 570 4GB Gigabyte
Power: PC YES ElectroV2 500W 80Plus