Acrobat Reader is closed suddenly and automatically, falling into background application.
Acrobat Reader's version 16.10. 11 (155604). My device is iPad Air (iOS 10.0.2).
I am facing exactly the same problem as Niztael (2016. 10. 6 am 11:28) is.
Recently I experienced the similar problem with Acrobat Reader. (https://forums.adobe.com/thread/2210144)
But the previous version 16.09.21 worked properly and seemed to be resolved.
Now the latest version (16.10. 11) has a problem again.
I am facing exactly the same problem
Acrobat Reader 16.11.01 is available in the App Store now.
It should resolve the frequent crashes that you have experienced.
Please give it a try and let us know if it works for you.
We apologize for the inconvenience caused.