I know ur problem, take off the back cover and remove the screw next to the wifi antennae which is the one left to the camera, (not on the side where the flash is at).
it should work. If it doesnt press on that area kinda hard n it shud work. i do this and lik once a month or twice maybe the same thing happens. It is a bad connection with the wifi antenna i believe. When it stops working i simply take off the back cover and just push on it. Usually it happens when my phone gets real hot.
---------- Post added at 03:32 AM ---------- Previous post was at 03:31 AM ----------
also sorry for late reply, i was just lookin around forums n found ur thread