Over the past couple days, I've noticed a significant increase in game crashes. During battle scenes, the screen will freeze, eventually turn completely black, and then exit to the main OS menu. There is no warning nor error message displayed. Upon relaunch, the game works fine for a period of time (30 minutes?).
This has happened both during the normal campaign (4-5 times over three hours mining Ch. 22 - The Impertinent Heroes). It also happened yesterday during the launch of a coliseum battle at which I lost contest points.
Heroes used today were:
I'm using a Samsung Note 5.
Edit: I'm on Server 5