I have Iphone 4s ios7.12 everything normal and WIFI OK.
When I upgrade to 8.1 my WIFI cant work...
When IOS 8.1.2 launch I upgrade again and my WIFI is normal again
When IOS 8.1.3 ready I upgrade again and my WIFI cant work again
And now IOS I upgrade to IOS 8.2 and my WIFI is normal again.....
How can it happened ??? It makes me nerveous when I want to upgrade IOS again...