WiFi on and off problem

Hi there,
I have acquired a new Dell Vostro V 131 which has Windows 8 preinstalled, WiFi was working well then it stopped working, I tried trouble shooting with no positive results, when I was almost giving up, the WiFi came on again, since then it has been on and off, System check shows all devices are in good working order, what could be causing the WiFi to go on and off?
