I recently bought a pc with an i5-11th/rx 560. I had to buy a hdmi-vga adapter because my monitor doesn't have hdmi.
I downloaded warzone and every time I entered the lobby the screen started flickering, I searched for all of the possible solutions and couldn't find anything. The flickering didn't happen while i tried cs 1.6, but when i tried playing LoL, it did.
While I waited for the adapter to come, I connected the pc to the tv through hdmi and the screen didn't flicker when playing warzone.
Here's a video where you can see how the screen flickers while I play LoL. I'd be thankful to hear from someone who knows why this happens/how to fix it.