If you have "Prefer Amon" on in Airwave, please try turning it off.
What could also affect that is if you manipulated any of the AAA timers on the Aruba Controller. They should look like below:
(192.168.1.3) #show aaa timers
Global User idle timeout = 300 seconds
Auth Server dead time = 10 minutes
Logon user lifetime = 5 minutes
User Interim stats frequency = 300 seconds