I am seeing this error in the logs:
Main Thread Checker: UI API called on a background thread: -[UIApplication statusBarOrientation] PID: 446, TID: 34097, Thread name: (none), Queue name: com.Flurry.Analytics.Session, QoS: 0
From the looks of it Corona is using 8.1.0:
Flurry: Starting session on Agent Version [Flurry\_iOS\_199\_8.1.0]
Flurry fixed this issue in build 8.3.0:
Version 8.3.0 - 10/12/2017 Fix for UIKit APIs called from background thread
Thank you
Adrian