I have an IPA2 wifi 3g working fine with wifi up for 3 monthes then from two weeks it get connection but after 1 minutes stop to serf/download with signal and connection always present. With the same router are still connected others 3 pc working!

I all, 
the scenario is the following:
WIFI connection with TISCALI operator. Encryption made by WPA2 EAS with router SITECOM or tested also with another router DIGICOM with WPA TPK.
From December up to end of March the IPAD2 working perfectly serfing and downloading.
By two weeks it has a very strange behavour without have changed any configuration on IPAD or network: 
with WIFI turned on it discover about 4 different ntw among them the mine, I successfully authenticate with psw the my ntw,
the IPAD2 start to run with Safari without problems, but after about 1 minutes, it stop to serf or download and answer that the Server cannot be reached or the page cannot be open, at the same time the signal is present on the icon of WIFI and it is strong.
This problem is systematic: If I dissasociate the ntw and then authenticate again I start to serf again for 1 minutes (more or less) and then it stops again, this occurs every time I authenticate the ntw after a disassociation.
I made some test changing the encryption from WPA2, WPA and also without encryption but the result was always the same, after about one minute the server seems to be for the IPAD2 no more reachable while the others PC and netbook connected to the same router continue to serf/download without problems!
I also tried to change the router with a DIGCOM that I did not use generally, but the behavour is always the same.
Since the IOS was the 4.3 revisin, I made the upgrade by means Itunes to IOS 5.1 succesfully installed.
But unfortunatelly all test repeted have had the same negative result with the same behavour!
Yesterday I tried to do the complete restore of the System but the tests had the same rsult. 
I really don't know how to proceed, the problem started suddenly without any action from my side....is there someone that can help me?
Thanks Massimo

Look at iOS Troubleshooting Wi-Fi networks and connections  http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks  http://support.apple.com/kb/ts3304
Additional things to try.
Try this first. Turn Off your iPad. Then turn Off (disconnect power cord) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
Change the channel on your wireless router. Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
If none of the above suggestions work, look at this link.
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Fix iPad Wifi Connection and Signal Issues  http://www.youtube.com/watch?v=uwWtIG5jUxE
 Cheers, Tom

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