no wifi , weak signal

iphone 4 was on iOS4.3.2 and no wifi showing at settings sometimes shows it and finds my network and connects for a minute than it doesn't find it anymore or goes no wifi, I thought was a iOS problem and restored it to the 5.1.1 but same thing what can I do?

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Answer this question I have this problem too

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3 Comments:

Are you using a case on the phone?

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@Michael, No I got no case.

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open your iphone and check if in the top of the motherboard there has a bolt, if there isn't you can buy the bolt from the ebay and the wifi will work you perfectly.

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