periodic network disconnects (reason 'ip-config-unavailable')

[Chuck Anderson <cra WPI EDU>]

On Fedora 18, I'm seeing periodic network disconnects with these
messages in the log:

Apr 27 11:01:11 a NetworkManager[833]: <info> (wlan0): device state change: activated -> failed (reason 
'ip-config-unavailable') [100 120 5]
Apr 27 11:01:11 a NetworkManager[833]: <warn> Activation (wlan0) failed for connection 'Sanctuary 2.4GHz'
Apr 27 11:01:11 a NetworkManager[833]: <info> (wlan0): device state change: failed -> disconnected (reason 
'none') [120 30 0]
Apr 27 11:01:11 a NetworkManager[833]: <info> (wlan0): deactivating device (reason 'none') [0]
Apr 27 11:01:11 a dbus-daemon[736]: dbus[736]: [system] Activating service 
name='org.freedesktop.nm_dispatcher' (using servicehelper)

What does reason 'ip-config-unavailable' mean and how can I
troubleshoot what is happening here?

I do have IPv6 on this network and found this bug report, but that
appears to be for an older version and should be fixed in the version
in Fedora 18, NetworkManager-0.9.8.1-1.git20130327.fc18.x86_64:

https://bugzilla.redhat.com/show_bug.cgi?id=753482

Thanks.