So I've had the Mavic about a month now and flown it at every possible opportunity. The first time I discovered an unopenable file was after a full battery run and capturing one 3gb video file at 1080p in .MOV format. VLC displays the video length as 0:00 and QuickTime displays a message saying "converting" and then an error message saying "file format not recognized". I changed the recording format to .mp4 and had no problem until yesterday when a similar sized .mp4 had the same problem. It doesn't play off the card or off my HD, the MicroSD card is the one which comes stock with the Mavic. Ugh. These were just test flights but it is really worrying me there is an internal problem. Does anyone have any ideas on troubleshooting this issue? Thanks a million!