The new update to airport sucks big time, many people have problems with it on the apple discussion forums. Reinstall airport 3.3 as it will fix the problem introduced by apple. You can find it there http://www.apple.com/support/downloads/

remember: loss of connections are 99% of the time caused by poor network drivers and poor hardware (routers, wireless stations). LW being one heavy user of connections, poor setups fail with it while browsing the web does not cause the same effect (very low demanding in term of connections).

Bonne chance

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