hostapd + 802.1X + ath9k - random disconnects

[Stefan Bauer]

Dear Folks,

we're using openwrt Backfire (kernel 2.6.32.27) 10.03.1-RC5, r27608 on
atheros hardware with ath9k and discovering random wireless disconnects in
our 802.1x (win server 2008 - NDS/Radius) environment.
Please see the log attached - client (00:21:6a:78:d5:9e) just lost
wireless connectivity.

http://www.cubewerk.de/dl/hostapd.conf
http://www.cubewerk.de/dl/wlan.txt

Client is Windows 7  -64bit - Intel 5300 AGN hardware.

Any help is greatly appreciated.

Best regards

Stefan