Question Games only working in Windowed Mode?

ToiletLord

Honorable
Jul 27, 2015
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Just built my PC a few months ago and it has been amazing. It runs COD Warzone at around 120fps and Fortnite around 140fps at 2560x1440 (2k).
All of a sudden warzone and fortnite are now performing considerably worse, hanging around 30fps. I have tried changing the priorities in task manager, turning off v-sync, etc. The only thing that seems to work is playing in windowed mode, or forcing the fullscreen mode into windowed mode by dragging another window on top of the game. I have no idea where to go from here or why this is happening all of a sudden any tips would be greatly appreciated.

CPU: Ryzen 5 3600x
GPU: Radeon RX 5700XT
RAM: 16gb (3200)
MoBo: ASRock X570 phantom gaming 4S
PSU: 800w
 

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