I have been read about wifi issue in thread, but it is still not clear about my issue. I recently bought MBA 13 base. When I surfing web pages, randomly a browser stops working (I tried both safari and chrome) and says web page cannot show...(I turn off wifi and turn on again, then it works). I wonder if it's lion's issue, so it will be fixed later or if it is defect of MBA's wifi chip or antenna. If it's defect of hardware, I have to exchange it.