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I've not witnessed it myself but it seems as though the Apple Support forums are filling up with it. Of course, some places are running with dramatic headlines on it but it seems to be an iWork Suite issue and not really a hardware thing as far as I can tell. One fix posted for it states:
Turn off the Documents & Data in iCloud Settings in iOS 7.
Go to “Settings -> iCloud -> Documents & Data”, switch off the Pages, Keynote and Numbers options.