UPGRADE WITH CAUTION!.
Update - out of the blue, starting just after I posted that all was well, my iPad Air 2 with iOS 11 began, and continues to DISCONNECT from Amplifi 150, consistently, at the 7 second mark, during audio playback. Performed the usual steps of disconnecting and forgetting the Amplifi 150 from iPad, rebooted the iPad, shutdown/startup the Amplifi, even uninstalled Amplifi app and reinstalled ... no luck. Totally screwed up now. After a few attempts, will play past the 7 second mark. Why is Bluetooth connectivity such a problem for Line 6 Amplifi? The distance between iPad and Amplifi is about 3 feet...