TS1559 iPhone 4S Wi-Fi button has greyed out

iPhone 4S wifi button has greyed out, though I did resolved it through Restore from backup button in iTunes, but after upgrade to iOS 7.1 it has again become greyed out after 2 days of upgrade.
And I tried even restore with Firmware update, even this has not resolved. Guys any suggestion how to fix this.
Apple please help resolve this issue, as this is happening with me again, I had the same problem with my iPhone 3G and even at Apple store they couldnt resolve this. (This was 3 years back) and now again I am facing the issue with my iPhone 4S.

Read and follow all the troubleshooting steps in the article from which this thread was posted.

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