Ipad2 keeps forgetting IP address

After approx 10 mins my ipad loses the IP address, subnet mask and router settings but it still shows the connected icon if have to put it to airplane mode a few times to get it back.  only started doing this when i updated to 5.1.1 if i use a static IP it loads the webpage but keeps giving a message box saying i am not connected to the internet.
My iPhone and computers are working ok on the smae network.
I have 3 access points on diffrent channels with the same SSID and am using Windows 2008 R2 as the DHCP server
Thanks
Craig

Try going to Settings app > General > Reset (at bottom) > Reset Network settings.  Then do a hard reset, hold down the power button and home button until you see the Apple logo, ignor the "Slide to unlock" message. Then try entering your network settings again.

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