I've had my MBP since July of 2007, and it has been a wonderful machine. However, when I upgraded to Leopard, I began to experience frequent wireless issues. My computer would not be able to connect to the wifi network after it was taken out of sleep mode, and I would have frequent wireless dropouts. After 10.5.2, however, the sleep problems disappeared, but the frequent dropouts have not gone away. The only way to fix the problem is to turn airport on and off again, and this only works for about 5-10 minutes. I thought that this was just a problem with the updated OS, but my cousin just purchased a Macbook and his worked fine on with my wifi. No dropouts at all. Also, my other PC's can use the network perfectly fine. What do you think could be causing these problems? I don't think it is a hardware issue (though never say never) because it worked fine with Tiger. My MBP is still under the one year warranty, so do you think the guys at the genius bar could help me? Any advice would be greatly appreciated. Thanks much.