IPhone 4s and can't connect to wifi,wifi is grayed out and says "No wifi".FREEZER TRICK WORKS!

I have iPhone 4s wchick cannot connect on wifi,wifi is grayes out and says"No wifi",i restart my phone,i reboot it and finally i restore it the problem remains,i put it on a freezer for more than 5 minutes and works for 1-2 minutes,but when outside temperature returns on the phone still can't connect on Wifi!what to do?
Anyone having the same problem?My iPhone 4s its not 6 months old!

Try restoring your phone usng DFU mode. Here are steps to get DFU Mode: Open iTunes on computer. Connect iPhone to computer. (some turn off iPhone here, I do not) Hold both home and power buttons for exactly 10 seconds, release power button, keep holding home button until iPhone recognizes iPhone in Recovery Mode. Usually takes 10-20 seconds of holding the home button. If the iPhone screen is black (blank) the iPhone is in DFU Mode.

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