Question I've been having issues and I cannot find a fix!

Mar 16, 2020
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Specs:

GFX: Raedon RX 590 Series
CPU: AMD Ryzen 7 2700x w/ AMD Stealth Cooler
Memory: 2 8GB Hyper-X DDR4 Sticks
Motherboard: ROG STRIX B450-F GAMING
Power Supply: ThermalTake 700W
HardDrives:
1: 500GB SSD Samsung
2: 2TB External Hard Drive

So, my computer functions normally whenever I do NOT play a game. Although, whenever I play games (Destiny 2 for example) after a while, the monitors turn black, and my GPU fans ramp up in speed. I have tested the thermal throttling and that is not the issues, I have been dealing with this for weeks and I just want it fixed. Any feedback is greatly appreciated. :)