Apple Devices Dropping Off Wireless Network

Hello, I have recently deployed a wireless network using a WLC 2504 with 21 Light APs. All seems fine except that
Apple Devices drop their connections every 15 minutes or so. A couple of minutes later they can reconnect but
obviously something is wrong.
Many Thanks

Only Apple device exhibit this kind of behaviour?
What kind of Apple devices?  Mac laptops?  iPad, iTouch, iPhone?
Have you seen this behaviour from, say, non-Apple devices?  Android?  Windows laptops?
What are the signal strengths when this happens?
Do you have Aironet IE enabled?
How far are the clients from the WAP(s)?

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