i think the ram got too much pressure, maybe you should close background apps. just saying tho. everytime i want play big sized game, i clear cache, task kill, im recomen you to install Master Cleaner to do the job (manually). Better if you restart your phone, then after turn it on, dont start other apps. just the game.. you want play good time with the game you gotta spend a lil time for it. i dont know if this help, but it works on me.