Wifi connection problems after upgrading to 4.3.5

Hello everybody,
I have the same problem on iPhone 4 and iPad 2 after upgrading to 4.3.5 (8L1): once you are connected to a wi-fi network and after you leave the device unused for a while (so that it goes to sleep) the wi-fi connection is lost and the only way to get it again is to switch wi-fi off and on. After that everything works until the next sleep.
Is anybody experiencing the same problem?
Thanks
Diciotto

I have similar problem with my iPad but not with iPhone 4. Have you figure out why and how?
Thanks,
Grace

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