PC crashing during gaming

[Real_EBN]

Yesterday I was gaming as usual and all of the sudden the screen went black and the fans in the PC revs up, it rebooted itself and took me back to the main screen. I tried to start up the same game but it happened again, tried with another game and it crash too. I started a game up the third time and I looked over my CPU and GPU temps (and power usage) but it was never exceeding 80 degree celsius, I looked over updates both on windows and my drivers but all was updated. I've had this PC for 2 months now and it has never happened before, it only happens when I'm gaming. 

[itsmyname]

@Real_EBN -- the fact that several apps "crash" your computer suggest that you have a hardware issue, not an issue with any of the software programs. 

I suspect that your computer is overheating. While your computer is running, feel the temperature of the air being exhausted from the back of your computer.  Hot?

When your computer is "cold" -- not powered-on for a few hours -- download/install/run the free version of the SPECCY software. It will display the current temperature of the motherboard, the processor, and the disk-drive, and speed of the fan(s), to give you "base-line" values.  Then, run your software for 5 to 10 minutes, minimize the software's window, and rerun SPECCY, to gather the same values.  Tell us what you see.