Platform, device version and operating system:
Screenshot or image:
What you were expecting to happen, and what actually happened:
I was playing a delve (not during faction event), Dark Court level 500 all faction team. I only had one troop left and was about to attempt the Dark Temple room (Spider Queen, Dark Maiden, etc.). When I clicked the big FIGHT button, I saw a strange loading icon appear with an image of Skeleton and a red exclamation point. After a couple seconds the game shut down.
When I came back I was credited with a loss (which I probably would have achieved anyway).
How often does this happen? When did it begin happening?
Steps to make it happen again