IPhone 4 Freezes during WiFi use (iOS 6)

Hi,
Every time I use WiFi on the iPhone it freezes. It connects normally, loads the app (mostly facebook, I have to check some messages) and then the screen freezes. It doesn't respond on on touch commands. I can lock it, press the home button and exit the app, but the screen is still frozen. I am not able to close the app and turn off WiFi. I have to wait a few minutes, every time the amount of time is different, and then I can use the phone for a few seconds and manage to close the app and turn off WiFi. After that the phone works normally. One time I wasn't able to even unlock the phone for 30 minutes so I had to walk away of the location and lose the connection to be able to unlock and use the phone. I don't know if it's only a WiFi problem or are some apps the problem, because I mostly run some apps during WiFi use.
Is anybody familiar with this kind of behaviour? Does somebody know how could I fix this and is it a hardware or, hopefully, a software problem?
Thanks in advance.

I was only able to restore the phone after booting into Windows and using the Windows version of iTunes. Kinda pathetic.

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