Same issue here. System freezes and has to be reset before I can connect to it again.
Wistron NeWeb CM9-GP with Atheros AR5004 chip
WiFi with WPA Enterprise + RADIUS
DHCP server (on 3 subnets)
There are about 5 Wifi clients and 2 hardwired clients.
I would also like to know what’s the best way to start trouble shooting this because I am not seeing anything useful in the logs.