Completely unplayable

This game is actually very very good. Probably one of the best FPS for iOS, but the frequent crashes makes it unplayable. I cannot get past mission 4 due to it crashing. It is a shame, because this game is really good, but is pretty much unplayable due to its crashes. Please fix this as soon as possible or I will try to get a refund.

bleecahd about Modern Combat 4: Zero Hour, v1.2.1