So we have all sorts of different Client adapters on campus. Issue has ranged from Dell laptops to WOW which is Work station on Wheels since we are a hosptial.
for the WOW's which is what i'm currently focusing the troubleshooting on is the following:
1) Netgear A6200 WiFi Adapter
2) 6.30.145.30
3) None
4) Not specific to a location or controller (we have two deployed on campus)
5) very random and how to pin point how often. We have different devices in different area's that have a disconnect daily. It could be 1 out of 10 devices in an area
6) Hard to pin point a date as most users never open a ticket but i'd say it's been going on for a couple of months (at least that's when i first herd of this issue)
All the same SSID using WPA2-Enterprise. We have a Cisco ACS server doing Machine Authentication with the device MAC address.
98% of devices have the standard Windows 7 Image we use on campus. Users on other platforms such as Windows 8, Mac OSX and mobile devices don't have this issue. But then again only a small amount of users have the non standard Windows 7 image.