iOS11 -touchesEnded method sometimes no longer called until view recreated

Question

I have an App (since iOS6) with a self made gesture/tap detector using -touchesBegan and -touchesEnded methods. This detector worked flawlessly for years, but since recent iOS Versions the following happens occasionally:

Sometimes at a random(?) point in time the GameView stops to receive -touchesEnded: until the view is discarded and recreated.

In my case I need to recreate the view by starting a new game.

I override all 4 -touches* methods now and do not use gesture recognizers. The GameView has subviews that implement touches, but those keep working as expected. -touchesBegan just saves the starting point and time of the gesture, so -touchesCanceled and -touchesMoved do not need to do anything.

Is there any change in iOS10 or iOS11 where I could start the search for the reason this might fail? An XCode Interface Builder setting maybe?