IPads/iPhone and Open Wifi Issue

Running Cisco wireless at a larger university and We're running into issues with ipads and iphones on our network.  We run an Open guest network.  No encryption.  But are having difficulty getting ipads and iphones, of variying models, getting connected reliably.   We get "error joining network" messages, but only for the Open networks.  Also, it seems Random.  3 out of 4 times it fails and then it will connect a few times and then fail again.  It makes no sense whatsoever.
Here is out network setup:
Wireless network enryption:  None (Open)
WLC is a 5508 Running version 7.0.222.0
We also have 2-4400 models running 7.0.222.0
APs are 1131's (ABG) and 1142's (AGN)
We have run several tests to confirm that this seems isolated to our Cisco envirnoment and only Open networks.  We have another vendors products on site (That we've been slowly replacing with Cisco) and have the same network configured there and are not having these issues.  We have also tried putting a WPA2-PSK password on the network for testing purposes, and that elminates the issues, however, we need this network to be Open due to requirements on our end.
We've tested everything from iPad 1's up to iPad 3's all running the latest iOS 5.1.1 as well as iPhone4 and iPhone4S version running 5.1.1.  All seem to have the issue. 
I'm running out of ideas for testing and troubleshooting this issue.  Any help or direction would be greatly apprecated.
Thank You.

I better explain this better:)
The session timeout will force a user to have to log back on the webauth. Idle timeout will allow the wlc to know of the iDevice even if it goes to sleep, or else it will timeout after 300 seconds which is default. Fast SSID change might not be needed unless you want the ability or devices to be able to switch to a different SSID or else the will have to wait for around 30 seconds.
Sent from Cisco Technical Support iPhone App

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