Why does my iphone keep losing wifi connection?

last week I upgraded from 3g to Iphone4.   I connected to my home wifi with no problems, but every time I leave the phone for a while, when I come back to it I find that it has dropped the wifi connection.  When i try to reconnect, I have to either press the pairing button on the phone every time, or start from scratch and reenter the wep password
My old 3g does not have this problem at all and remains connected all the time.    I called Orange and all they did was send me a replacement Iphone but I am still having exactly the same problem.
As long as  am using the  phone the connection is fine.   But if I put the phone down and it goes in to "sleep" mode even for a few minutes, the connection drops.
Any ideas please as it's driving me nuts - I'm even thinking of ditching the phone and sticking with my trusty old reliable 3g!
thanks!

The backed up data in this regard for your 3G has nothing whatsoever to do with your 3G not having the same problem. Some of the data in the backup may be corrupt, etc.
What does you have tried resetting everything include?
Does this include resetting network settings on your iPhone 4 and/or include restoring your iPhone 4 as a new iPhone or not from the backup?
Do you connect your iPhone 4 to any other wi-fi network besides your own? If so, does the same occur with every wi-fi network you connect your iPhone 4 with?
In your original post, you said WEP password.
Have you checked the manufacturer's website for your wireless router to see if a firmware update is available for your wireless router model that you haven't installed?
http://support.apple.com/kb/TS1398

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