The screen is turning around sometimes, what's that?
If you hold your device in a very planar way (glas-side horizontal), it can flip 180 degrees from one to the other landscape orientation. This should be explained via VoiceOver, if you have turned it off, you will not hear any orientation changes.
Hint: You can block orientation change in the Apple menu.
Last update on 2018-09-23 by Hansjörg.
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