Forgive me if this question has been answered before but I am having real problems with the built-in Airport card with my Powerbook G4. It works fine for about five minutes and then drops the connections and doesn't see any wireless network. This is puzzling because it has worked fine for the four months I have had the machine. If I switch the machine off for about 20 mins it comes back fine only to go down again after five minutes, whether I am using the Internet or not. The only different thing I have done is run the computer occasionally off the battery recently (well it is a laptop) and since then the battery will only recharge to 95 per cent. I know this is highly unlikely to be connected. Any help would be most appreciated because the machine isn't much use to me without the Airport card.