What you were expecting to happen, and what actually happened?
When I’m using GoW on my iPhone with mobile data with speeds lower than 3G, I expect the speeds to be slow and getting lots of “please retry” dialogs (although I constantly wonder if the connections to the server couldn’t be reduced and why so much data is sent that it fails).
What actually happened several times in the last days is that when I close the game because the spinner is spinning endlessly (without the retry dialog appearing), I get the message that data files are corrupted and I have to reinstall the game.
What are the steps to make it happen again?
Use the game on a slow connection, close it while the spinner is spinning.