I can confirm this for hardy as well, my laptop is a Samsung P35 (more info in 
attachment).
This bug occurs very rarely for me (once every 20 boots or so), but it seems to 
be caused by heavy network traffic shortly after the activation of WLAN.
When it happens, it looks like this:
- login to Desktop
- connects to WLAN automatically via NetworkManager
- I start Update Manager and check for updates / I start streaming a video file 
from another computer / etc.
- WLAN works fine for a few seconds
- Suddenly WLAN stops working in the middle of the updates check/etc.

As described above, the workaround of rmmod & modprobe works.

** Attachment added: "info.txt"
   http://launchpadlibrarian.net/12631809/info.txt

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ipw2200 uninitialized at boot
https://bugs.launchpad.net/bugs/86183
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