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Hi AndyT
>you can try removing all wifi networks on your phone, restart it
>then start connecting it , with your network and see whether it works or not
>if possible try connecting to different wifi network if available and see it connect to that network too, if it is not connecting then there might be problem with the phone software
let us know
Manjuboyz 
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Still doubt, the wifi disconnects?
Or goes connected but not browse the internet either?
Try this, turn off and turn on the router, to synchronize again.
After the router has synchronized (usually a few minutes) try again to see if the wifi so well connected and well let you use internet.
A greeting.