Wireless connection lost after some time ?

The wireless internet connection works just fine when browsing safari or the appworld, no problem at all...After locking the ipad and using it a few mins/hours later, I usually lose the internet connection. It says im connected but safari/appworld wont load unless I turn off the wireless connection or renew lease in the options.
Can someone please tell me why is this happening ?? Its been happening since I got the ipad, so an app cant be the cause ..
Please help !

The router firmware has the latest version ... I dont think its something with the router, because I use my laptop wirelessly as well and I dont have such problems. My friend has an iPad 1 and he doesnt have the same problem as mine either ..
Is there an app that can fix this ??? I thought it might be an email problem because my older Android phone usually lose connection when trying to fetch emails, so I activated PUSH function on the ipad, but that didnt fix the problem
Please help !!

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    2. after using for some time, i put the iphone aside
    3. when i want to use the wireless again, the iphone is not yet connected to the wireless 
    4. i would then need to search for the wireless signal and connect again.
    This causes problems because i am using some VPN connection at my laptop and it would disconnect it.
    Is there any config that would keep the wireless signal ?
    Thanks!

    Try changing the wireless channel on the router.
    Also try to change some advanced wireless settings on the router. Click on Wireless tab and go to Advanced wireless settings. Change the Beacon interval to 75, RTS threshold to 2307 and fragmentation threshold to 2306. Save the settings.
    See if that helps you.

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