I never had this problem when I was using Snow Leopard, but since I've updgraded to Mountain Lion, every time I wake up my computer, the Wifi freezes. What are

I never had this problem when I was using Snow Leopard, but since I've updgraded to Mountain Lion, every time I wake up my computer, the Wifi freezes. What are developers doing to fix this problem. I'm getting tired of force rebooting in order to connect.