IPhone 4 no longer picks up WiFi signal

Has anyone else experienced this?
My iPhone 4 which is less than 2 years old, no longer picks up WiFi unless it is right beside the router. This means I am having to rely on 3G signal in my own home! No other electronic devices in my home are struggling with this issue. This is still an issue when I am in other places with WiFi, the phone ocassionally recognizes that there is WiFi available but by the time it starts to connect all the WiFi signal has been lost again.
I have tried:
- turning my phone off and on.
- updating my phone
- turning on and off my router
- searching for a solution to this online, but it seems I am alone in this issue.
Help! Please! What should I do?

I restored my iPhone and nothing has changed except I have lost several hours of my life trying to make sure everything is backed up and then trying to reset all my apps.
I restarted the iPhone as a new device, still no wifi connection or ability to recognize any wifi networks.

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