Wifi not working iPhone 4s

Wifi is not working any more on my iPhone 4S !
Two days after updating to iOS7.1, wifi is not working any more on my 2 years old iPhone 4S.
Searching google, iOS7.1 is a major problem for many iPhone 4S.
Resetting network connection as recommended by Apple did not solve it, also complete new installation with iTunes did not solve it.
Bluetooth connection to my car is also not possible, inspite of the fact, that I can swich it on in the control centre.
Wifi can not be switched on at all !!
Apple, what are you doing ? What is the fix ?
Thanks for your help and best regards.
Dirk

Wifi is now working again !
Is really a hardware issue ?
Lets see, how long it lasts.
Solution:
My wife found this via google search, and this is not a joke.
-Place the iPhone on a soft towel or so and keep it switched on.
-Heat it with a hair dryer from the side with the earphone plug.
-After a few minutes, it warns "temperature" and turns itself off.
-Let it cool down. You then can switch it on (wifi still not working).
-Reboot now by holding home and on buttons until the Apple logo comes back.
Thats it !  My iPhone 4S straight away connected to my home wifi......

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