Wierd problem, Computer randomly restarts

[UsernamePassword]

So this have happened 2 times now since I fresh installed my computer.

 

First time was when it was pretty fresh installed, then it never happened for 1+ month I think? 

 

Then now it just happened again.

 

I was simply browsing Ebay and watched a Youtube video and out of nowhere the computer just restarts itself,

First it freezes for ~3 seconds then it restarts and boots just like usual.

 

Specs:

• Asus Z97-A
• I7 4790K
• 16Gb DD3 ram
• Zotac 1080
• Windows installed on Samsung ssd
• Windows 10 Pro 64Bit (Full version not cracked)

None of these are overclocking nor was I doing anything special.

 

I did not get a bluescreen or similar, Just freeze -> Restart -> Back in windows within 15 seconds.

 

Anyone has any idea how to find out what could be causing this?

[gamingneeded]

could be overheating, if you didnt install the cooling right (no contact) or if you didnt put the thermal paste