While using my laptop for my short-lived work in October, it developed a problem where it would just drop the wireless connection and then couldn't reconnect. There was a brief period of time where it did this when I first bought it as well. Regardless, it's annoying.
I want to believe that it's a software problem, but hell if I know what causes it. I hoped that the recent OS X update would have solved the problem, but it still happens. The only remedy is to reboot.
God really wants me to have a new one.