I have a word game app which takes quite some time to play. Unfortunately, just towards the end of the game it sometimes freezes. I cannot unlock it and since i cannot close it (because its frozen) all i can think to do is to delete it and load it again from the store.
Sorry, no ideas but I'm having the same problem with a couple of games I play on Facebook which steadfastly refuse to download fully. Annoying, isn't it?!