Hi, same problem on my iPad 4 mini, latest iOS. When Ihave opened Enpass and change to another app e.g. to copy a pwd or username just entered and want to go back to Enpass (via iOS control center or swipe left with 4 fingers or by going back to the home screen and using the Enpass icon) it hangs up (white screen) at the latest after the second time I do that. Usually I do it twice when I have a new login created and want to insert username and password.
It crashes more often when I have the ‘new login’ menu open in Enpass and not pressed ‘Save’. Alas all entries are lost then.