WLC Problem 4.0 with mobile devices

The problem is we have a WLC version 4.0 and have multiple SSIDs, but one has been created with WEP security is specific to the directors of the company. The scenario is that mobile devices (Blackberry, Iphone 4, IPad 2, etc) have connectivity problems
One of the scenarios is not automatically sign the WIFI mobile devices and can only be after several attempts. Another scenario we have is that it takes over 15 seconds to take ip and be signed into the network. Finally, it is to tell us that after a while the devices are out of the WLAN and take again after several attempts to register or
I hope I can guide
GREETINGS!

Marco,
My recommendation is that you upgrade your controller to current software. 4.0 is ancient code.
Justin

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