Mountain lion osx wifi keeps turning to "off" setting by itself.

Mountain lion osx wifi keeps turning to the "off" setting by itself and when I try to turn it back on again it doesn't change from "off" to "on" Any ideas about whats wrong? The only way I can solve it is by restarting the macbook.

I have a macbook pro

2.53 ghz intel core 2 duo

8gb memory