Need help with annoying problem

Hi guys I would need some help I built my first pc about 3 weeks ago and everything was fine but since last week its shut down for no reason 2-3 times now and comes back on a few seconds after and everything is really slow for a few seconds then i get a 30 q code on my motherboard meaning that the computer is waking up from sleep mode but I have turned that mode off as soon as I started using it anyone know what can be causing this problem.

my build : i5-3570k, Asus V formula, 8g ripjaws 2133 with a radeon hd 7970 ghz edition. 

This link may help you i hope it does

try what they try 

I will try that and see what it does thank you very much for the reply.