Problems with app updates & installation

I think this game is awesome, one of the best games Ive ever played, but I was having a problem with the updates. It would say that it was updating and the progress circle would fill, but all of a sudden it would quit or start over and not say a thing, like there wasnt a problem. I tried deleting it and re- downloading it, but it wont let me re download. It shows that its downloading, but when I get out of the AppStore, it doesnt pop up on my iPad. I havent played in 6 months any Im extremely bored. Great game though...

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