I'm using Asus A450L with Windows 10, Intel i5-4200, with motherboard Nvidia Geforce 820M, with 4GB of RAM. The problem is when I was playing game, such as DOTA 2, my laptop will suddenly blacked out and the screen go dark. I thought my laptop went to shutdown but when I press the power button again, the laptop turn on and the running programs in the taskbar before the screen went dark is still open. So I assume my laptop went to sleep mode. But it sounds weird because my laptop go to sleep mode while I'm using it? I've already tried all the option from power option to set 'never' for the sleep option. And I have also disable everything in advanced power option for the power plan that I'm using. But it still happens. If overheating is the problem, I've checked my CPU temperature and it range from 50 Celsius-60 Celsius. I searched the internet and it says that the temperature is okay and do not cause overheating. By the way I connect my laptop to a monitor. Anybody has this experience or can help me to solve this problem?