App goes into background spontaneously on launch leaving launch image showing

When I run my app from XCode debugger, it will occassionally freeze on the launch screen. Presssing home button has no effect. Double-press on home button will show the running apps as expected and fixes the problem: the launch image will be replaced with my UI in that background view and bringing it back to foreground works fine. Watching the log, I can see that my app responds to applicationWillResignActive shortly after launch, and goes into the background, as if user had pressed home button. I can't see anything the device log that would explain it, although I don't really know what to look for. Any suggestions? I wonder, is it an issue interacting with the XCode debugger, and possibly nothing to worry about for deployed app? I have seen this only on an iPad, running iOS 10.2. The iPad is new, but I also made a lot of recent changes to code, so not sure of the relation.

>I also made a lot of recent changes to code, so not sure of the relation.


In that case, be sure to _always_ Use Xcode's 'Product' menu with the option key pressed, then select 'Clean Build Folder' to force Xcode to acknowledge the latest change.

App goes into background spontaneously on launch leaving launch image showing
 
 
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