Reply to Upgraded to MTN Lion & having some issues

hey guys,

hopefully a quick one.. and my apologies if this has already been answered it's 6.40am and im shattered so feel free to shout at me and tell me its been posted already & i'll look for it later....

however...

i upgraded to mountain lion yesterday & ever since i'm having issues with my wifi, when it wakes from sleep or starts up sometimes it says no wifi hardware installed.

sometimes if i restart once it sorts itself & other times i have to restart 2/3 times to get wifi.

any ideas?

thanks in advance & sorry for being a lazy b**tard