Unhappy [Q] Injustice: Gods Among Us. Help

So I love Unjustice, and its a really great game. However, it constantly freezes on my S4 and the sounds is all squeaky. I have cleared cache, reinstalled several times yet it still freezes and even crashes. Other S4 users i have personally talked to have not had this problem. Does anyone else have this issue, or is this an issue related to the app not being optimized for KitKat (running CM11). Thanks!