Airport Card on the blink

Hi - I have three 14" ibooks on the same airmac network. One of them, an iBook 900mhz, keeps dropping the airmac connection due to: 'unable to find airport card' error. If the computer is then turned off for sometime then it is then able to reconnect to the network, say for about 30 minutes before the connection is again dropped, and so on. The ibook is fitted with 2 extra fans for cooling and the room is about 26C. This has occurred with OS 10.3.9 and also 10.4.2. The airport card is fixed perfectly.
Any comments of ideas welcome.
I thought the airport card may be no longer any good? Also, I tried to see the other two posts on where to by aircards of Mac (not extreme) but the 3 companies listed are for domestic US only - I need international; if anyone knows a supplier who will ship overseas that into. would be helpful.
Thanks
Steven, in Japan

The airport card in the iBook is still switching off without warning after some 30~40 minutes of use. If the computer is turned off for say 30 minutes then the airport card joins the net work without any problems. Two other similar iBooks on the same network have no issues.
At first I thought the problems was due to overheating in that particular iBook so I have now installed a two external cooling fan system. WHile the computer is running much cooler the Airport card is still switching off without warning intermittently.
Is there any way to test this Airport card - or does it need replacing. I have found one source of replacement cards, but I am unsure this situation will improve if the airport card is changed.

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