This is a problem that APPLE has to fix, not us.
I'm getting this dealt with since I got my S4 about a month ago. Tried everything. Still I have to be asking my iPhone friends to press the error message and send their replies as SMS. Which works but still a pain.
I go to settings, connections tab, see the Wi-Fi turn on/off button, does not start when I try to turn it on. It goes back to off right away. I already restarted the device.
Please advise. Thank you.