Fun, but...

This game is really addictive and fun, but I cannot get it to work properly for me. I have deleted and re-installed it several times hut each time it tries to download everything at app startup the download fails, the app returns to the title screen, and the cycle starts again. Im very disappointed by this cos I really want to play this game!! Anyone have a way to fix this?? I am playing on iPhone 5s

becca_chan about DRAGON BALL Z DOKKAN BATTLE, v3.0.1