Hey everyone ^_^!!!
OK I have iPhone 4S on 6.0.3 (version software doesn't change anything at this point) and I just tryed to put it in the fridge (about 10 mins) and it did work...!!! (for like 20mins or so but it worked!)
---> Wifi works when i start the device and stop after few seconds.
---> This is the only reason I see : overheating something.
Doing reset internet settings, iTunes recover, blablabla is part of the SOFTWARE troubleshooting section and if it works for you, great! But if this DOESN'T WORK and you have to put your phone in the **** fridge I don't call this a software problem loool
And I am clearly not the only one experiencing this physical (hardware) WiFi issue. There are a lot of posts about that since the 3gs. And I'm pretty sure a 950$ device from such a strong and great company shouldn't be needing 10 mins in the fridge to work properly even if it's a beast and technology is so great... I think.
Logically, the minimum would be to do a sort of recall or repair of thoses Apple failed production pieces... for the first time I am considering to move to another platform... I'm pretty sad of Apple service. I hope they do something about that one day, but I doubt. But who knows. Who knows!!
Good luck with that!