WEP password not accepted. Two separate Airport based offices.

I have an Airport network setup in two different locations/offices (Leeds and London).
It was all working fine and the WEP password worked and the iBooks and Mac Books all logged in automatically once setup. This worked fine for months from installation.
Now, for no apparent reason and no changes on the AirPort, the WEP password is not being accepted and the laptops cannot connect any more.
Has a software update done this? I can't think so as 3 of the laptops have not been updated for the last 3-4 months and the Airports started acting like mthis two weeks ago.

Hi,
The Airport base Stations have not been updated since purchase. One is about 7 months old, the other about 2.5 months old.
Does this mean you think that the previous software / formware was faulty and this discconnection or loss of WEP password is simply a fault and a SW UpDate will fix it?
I've not tried your suggeestion of no encryption or WPA yet as I will not visit the sites again for 3-4 weeks, but surely any setting available should be stable?
Thank you.

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ngfjdgbkrngljr,
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http://discussions.apple.com/thread.jspa?messageID=6053272
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WEP password not accepted. Two separate Airport based offices.

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