Sony xperia SGPT122 wifi connection problem

I have xperia SGPT12, android version 4.1.1, kernel version 3.1.1. Recently i have experienced a problem with its wifi. The wifi is not getting connected to any of the internet connections i have despite being deteced, saved and secured with WPA.  I have tried the following but of no avail:
1) Hard reset my device
2) forgetting the connection and reconnecting it
3) checked my internet (2 connections), working perfectly with all other devices.
Urgent help wikll be highly appreciated...

dear,
i had purchase the sony xperia Z1, since yeterday i am facing problem with the WIFI, even short distance it's becoming disconnecting, really i am facing problems, if you could advise to me how resolve this issue.
Awaiting for your response.
Regards

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    2) forgetting the connection and reconnecting it
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    Urgent help wikll be highly appreciated..

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    ~~~~~~~~~~~~~~~
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