I'm not sure if this is a hardware or a software problem (hopefully software), but two or three times a week, my airport card just stops giving me internet. It still picks up the signal, but I can't get online. I then restart my computer, and it works perfectly fine until the next time this occurs. It's not my network, because only my main Powermac is affected, and it can't get internet from the neighbor's network either (I only did this to test). Any ideas as to what the problem is?