I have the same problem using an apple airport express as AP. In my case the 
problem is clearly related
to distance to the AP and signal strength. If I am close to the AP (say 5 m), 
there is never any problem.
At 15 m, download rate suddenly drops to 100 kB / s. In that case, iwconfig 
reports "Link Quality=40/70  Signal level=-70 dBm".
If the module is reloaded, transfer rate is good again, but only for some 
minutes.

This bug exists since the birth of iwl3945... I have had it since 8.04 ! Any 
chance to see it fixed one day ?
What can we do to help ?

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iwl3945 slow down after some time to 100kbps, unload/load module return speed 
to 1.5mbps
https://bugs.launchpad.net/bugs/340418
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