According to the first log entries in WifiSyslog.txt, the connection
would have stopped because no wifi beacons were received for a while.
This could be either an issue with the wireless card or with the access
point... It's unfortunately very hard to figure out.

Jun  5 18:11:33 localhost NetworkManager[910]: <info> (wlan0): supplicant 
connection state:  completed -> disconnected
Jun  5 18:11:33 localhost kernel: [ 2005.540083] ieee80211 phy0: wlan0: No 
probe response from AP 00:18:e7:d2:bf:6e after 500ms, disconnecting.
Jun  5 18:11:33 localhost kernel: [ 2005.541611] cfg80211: All devices are 
disconnected, going to restore regulatory settings

What could be tried would be to install the broadcom driver packages
from oneiric on natty, but I'm not sure whether that's really supposed
to be doable, or how well that might work.

** Changed in: network-manager (Ubuntu)
       Status: New => Incomplete

** Changed in: network-manager (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/793328

Title:
  network-manager drops wifi connection and fails to reconnect

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