I also have this problem and it's very annoying.
Every 2 minutes exactly, the wireless network stalls because network-manager 
performs a network scan.
In some drivers (like the atheros ath9k) this causes the network to completely 
stall from 1 to 5 seconds.

This bug is already known upstream and there is a bug report in the
redhat bugzilla as well:

Upstream Bug Report:
http://bugzilla.gnome.org/show_bug.cgi?id=513820

Redhat Bugzilla Report:
https://bugzilla.redhat.com/show_bug.cgi?id=490493

I have created is a workaround patch that disables scanning if your device is 
already connected to a network.
This patch is based on a suggestion from Christer Weinigel in the Redhat 
Bugzilla report, but it's not the ideal solution.
Of course, by using it you won't have an updated network list while connected, 
but your network won't stall.

I also have compiled packages of network-manager for jaunty using the attached 
patch:
https://launchpad.net/~volanin/+archive/ppa

In old versions of Network Manager there existed an option to enable/disable 
scanning, but it was removed.
Related bug report about optional scanning:
http://bugzilla.gnome.org/show_bug.cgi?id=165933

** Bug watch added: GNOME Bug Tracker #513820
   http://bugzilla.gnome.org/show_bug.cgi?id=513820

** Bug watch added: Red Hat Bugzilla #490493
   https://bugzilla.redhat.com/show_bug.cgi?id=490493

** Bug watch added: GNOME Bug Tracker #165933
   http://bugzilla.gnome.org/show_bug.cgi?id=165933

** Attachment added: "This patch disables network-manager scanning if the 
device is already connected."
   
http://launchpadlibrarian.net/29240580/network-manager_disable-scan-if-connected.patch

-- 
network-manager fails periodically , on backgound networks scan?
https://bugs.launchpad.net/bugs/373680
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