Monitor Turns On and Off When playing Games

[koreanese]

I have a 27GK750F-B, and it works just fine when I'm not playing games. However, whenever I go in a game with 240hz, my monitor (20 minutes into the game) turns off for 3-4 seconds, and turns back on at random times. This happens so much, and I get really upset with it. I get 220-250 fps on CSGO, with an AMD CPU, and an rx 480 4gb. It can run just fine, but when I change my display settings to 144hz, and the game is running at 144hz, it works just fine. Note: This only turns off when I'm playing games, and not just browsing. It's really frustrating, and I need help

 

[DondoFX]

I got this problem as soon as I enter a game and it's at a resolution higher than 2k. Or if it's a windowed game and desktop is in 4k. Turns off and on every 1-2 seconds. Really, really annoying.

Specs:
XFX RX 480 4Gb
Samsung U28D590D and a second Acer 1280 x 1024 monitor.
Ryzen 2600
16 Gb Corsair Vengeance LPX 2400Mhz C16
Windows 10 Pro.

No OC on anything.

 

[DondoFX]

I'm guessing we will have to stick with this until one of us finds a fix. :\