My dmesg looking like this:
[48754.543729] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[48754.752857] r8169 :02:00.0: eth0: link down
[48754.753212] ADDRCONF(NETDEV_UP): eth0: link is not ready
[48755.006093] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[48757.616276] wlan0:
Found solution here:
http://azitech.wordpress.com/2010/02/22/deauthenticating-reason3/
killing wpa_supplicant helps. Daemon immediately resurrects and
connection becoming stable.
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