Maximus VIII Formula Crashes

[Chunmngm]

I have the motherboard specified above. Sometimes, my computer crashes at random times and sometimes my computer starts alone after I turn it off with an A2 code. It's been for a while. What can I do to fix it.

Build.
I5 6600K
Maximus 8 Formula
2x4 Corsair Dominator X
2x8 Corsair RGB
*Both DDR4 & crashes has been happening since I built my rig.

 

[hang-the-9]

Is anything overclocked? What is the brand and model of power supply? Do you have a video card installed? Any USB devices outside of the mouse/keyboard in the system or a cable just hanging off a USB port? Did you try with one RAM stick at a time? How many hard drives do you have in the system? If more than one, unhook all except the boot drive.