Screen Pixelation

Hi, I have Alienware 17 r4 with 1070 gtx, 16gb ram, i7 7th gen and 4k display laptop. Whenever I play any game on the laptop (csgo, dota2, forza7, cod ww2) the screen is getting completely pixelated and nothing is working. I have to power shut down the laptop and restart it again. I am not able...