It could be high use of Memory, or it could also be your Internet. Was your Internet working at this time? I have noticed that certain games I have downloaded won't work if I am not around a Wi-Fi hotspot. Even certain games that you don't play with other Online players won't work if you don't have access to the Internet while playing them. I would say to first make sure you are playing at a Wi-Fi Hotspot, and if you are to shut your iPod off and try again.
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