When running my app on device and than testing offline mode by clicking flight mode on device itself, after 3 seconds i\'m getting this message:
Restore
Ok, i found workaround. Just turn off the Personal Hotspot in Settings. For me it worked. <3 Apple...
I am experiencing the same problem. A little showstopper when trying to check the offline behavior of your App (e.g. Reachability, custom error messages etc).
This is a known Bug with Xcode 7 and iOS 9, already reported with Apple some month ago: http://www.openradar.appspot.com/23021571
You were likely unable to find it because it's not called "flight mode" but "airplane mode" officially.