I have a macBook Pro and started having problems with my airport card recently. When the card is under load, it dies. it simply shuts off with no way of turning the radio back on, except for a reboot. If I reboot the wireless connection comes on happily. Until I start putting some load on it. It does not seem to be excessive load in terms of throughput, it seems more like the number of simultaneous connections which cause the problem. It usually happens when I leave Apple Mail running with all my mail accounts online. My GMail account seems to be the baddest of the bunch, as i have several folders and many GB of data. If I leave it disconnected, sometimes I stay for days without problems, but that's not a guarantee. Even with Apple Mail not running I sometimes have 'dog days' where I lose the wireless every few minutes. I have already tried removing the battery, resetting the PRAM and reinstalling the OS, but the problem persists. I am thinking about purchasing a new airport card now, but I would like to ask the community if others have experienced similar problems?