I have to comment on this also, from my own experiences,,, never had issues prior then suddenly I would send out my P2 on a flight which I thought was great till It gets back and finding out it had stopped recording also,,,, checked everything also thinking the bluetooth maybe turning on and interfering...
It was also suggested to replace the card, I too didn't believe it, checked the gopro support suggestions and purchased a recommended card for the gopro3 black + and never had an issue since.
Something where the data recording to the card couldnt keep up.... Purchase a recommended card they are reasonably priced than before. It solved my issues.
Good Luck
wcough