wifi issues

hi all my note has wifi issues every time i try to switch wifi on it thinks about it for a few mins and then switches off again. wifi used to work before stock ics update then it become intermitant it would work most of the time as long as the ram usage was kept down. i tried flashing ics again to see if that would help now it dosnt switch on at all ive tried the latest jellybean rom and even going back to gingerbread nothing works. does anyone have any ideas of things i can try before i buy a spares or repair note for a new main board.

thanks