The crash problem is a memory problem. There is too many stuff in the game at the same time.
I checked it out. Modern War takes the most memory of all my games.
It is only on IOS.

But as i see how your programmers work, (every event is a mess) then they dont know how to handle memory issues in the game.
So stop with new all the new stuff such as hardcore Boss. You tried it two times and it failed.
You are making yourself rediculous as president Hightower if your team is presenting 2 times such a mess.
Stop this event no one likes it .
My top 10 team doesn't like it at all.