If you are playing Transformer: Earth Wars on older iOS devices (i.e. iPhone 6, 6+, iPad Air, iPad mini 2&3) and the game keeps crashing, It's more likely due to lower amounts of RAM of your device.
Unfortunately, there isn’t a lot we can recommend except for freeing up as much RAM as possible by turning off all background apps prior to launching the game.
However, we are constantly trying to look for a way to optimize game performance for such devices. We would appreciate your understanding on this.