Question Computer hard crashing when playing games such as fortnite.

[SuperiorForces]

Heyo. My computer is perfectly fine on other games (such as roblox) But any other games like Black ops 3, Fortnite, GTA V, all run for 3 minutes to 1 hour before crashing. My CPU temps are fine, My drivers are up to date, and here's my specs;
PSU: Masterwatt lite 700W
Motherboard: GA-Z170XP-SLI
RAM: 2x8GB HyperX 1333MHz Dual channel
GPU: GeForce GTX 1050 Ti
CPU: Intel core i7 6700K
I've also done a clean install of Windows 10, and I still can't identify the problem. My GPU and CPU never go above 65C when playing these games and they never reach 100 percent. I can't find the culprit and I have my doubts about the power supply, yet I am not too sure.
If someone could help me out that would be greatly appreciated.

 

[Juan_Bijero]

What error(s) did you receive?

 

[SuperiorForces]

No errors. Just hard crashes.

 

[andrix10]

I keep receiving dead threads but it seems similar stuff like mine, did you fix it? For me reliability thing said kernelerror 141 and 187 if I remember correctly.