Ipad air (2013), non-cellular. iOS 12.1 Wifi connects, but does not display the wifi icon at top of screen. Everything works EXCEPT Messages, Mail and Facebook. All say not connected to the 'net. Other apps that require connection work just fine. Am out of country at the moment and will do a backup and then reset to see if that clears the problem. Has anyone else ever experienced this? Any suggestions/solutions?