Could be a bad micro sd. Have you tried a different one yet? This happened to me on a P4P. Pissed me off, lost some pretty I'mportant footage.
Or it could just be that your card is full! Unless you reformat the card in the Go app, file pointers may not get reset correctly. Deleting files or reformatting when the card is in the computer often doesn't reset them and the camera thinks that there is no more room on the card.
@olemus
First thing to try, format the SD card with the app, This has fixed mine and many others, if not then try another card.
Rod
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