Hi there,
I wish to know if you had in the past people reporting issues with corrupt files, as in, files that are still readable but Google Docs does recognise any more unless you download them in.
Please have a look
https://drive.google.com/file/d/0B1rwadXoy_PIMm4zamdQVzdPZ1E/view?usp=sharing
https://drive.google.com/file/d/0B1rwadXoy_PIUU41MG1oREhySWs/view?usp=sharing