What do you see in the syslog around the time that the "wlan adapter
looses network"?  In the syslog you supplied it's not clear where the
problem occurs.

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

** Summary changed:

- Wi-Fi looses connection with hidden wireless networks
+ Wi-Fi connection to hidden wireless networks broken after 20 minutes or so -- 
Atheros AR9285 ath9k

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https://bugs.launchpad.net/bugs/770000

Title:
  Wi-Fi connection to hidden wireless networks broken after 20 minutes
  or so -- Atheros AR9285 ath9k

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