I have worked around this bug in my environment by simply disabling the
802.11a radios on our wireless infrastructure.

I have been able to show that this bug occurs with only one access point
providing a given SSID, but only if the access point is running both
802.11a and 802.11b/g.

It is possible that this is actually a bug in wpa_supplicant, but being
triggered through the (arguably excessive) roaming that Network-Manager
causes.

My feeling is that roaming may not work properly when trying to
reauthenticate to an access point on the other band, since it is
technically already authenticated to that access point. The client,
however, likely doesn't know it is the same AP, and therefore, already
authenticated to it. This however, is not based on anything but gut-
instinct.

Once again, this bug does not occur on Fedora Core 12 (running Network-
Manager), OSX, and Windows XP.

-- 
network-manager roams to (none) ((none)) - background scanning
https://bugs.launchpad.net/bugs/291760
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