WiFi Problem after iOS 4.3.3 update

Hi
After the update to the IOS 4.3.3 all of the IPAD 2 from my company(six IPAD 2) I started to have many problems connecting to wireless network from my company.I saw that the IOS 4.3.4 the bug persists.
I would to now if the IOS 4.3.5 fix this BUg or i have to wait until IOS 5.
Regards
VC
iPad

First, Thank you for the support that you are given me related to this situation,but you have to understand my reluctance to accept that this is not a IOS problem because all the six / seven have the same problem.
(five minutes after)
I tested a new connect using WEP and I coul connect with problem.When i try to use WP2-PSK, no connection.This situation in both technologies(Cisco and Alcatel)

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