Computer Micro Lag/Restarting (Not sure if right section)

nowayy

Distinguished
Aug 28, 2011
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I built myself a desktop last summer (high specs)
GTX 770 2GB
Intel i5 4670K @ 3.4 Ghz
Motherboard Z-97A
8 GB Ram
Windows 8.1 64-bit
Powersupply
I think my PSU is a Corsair 850W

My computer will occasionally restart randomly or lag and then micro-lag until the computer is restarted.

I'm not sure what the problem could be and would appreciate any help I can get,
Thanks.