I noticed when I flew my MA2 for the second time that the file numbers started over again. I saw on the DJI forum that everytime that a card is formatted, the numbering sequence starts over again. DJI knows this and says that they have sent the issue to their engineers. In the meantime, a work-around is to leave one file on the card with the last file number on it in the proper folder and the card will continue numbering upward from that file number.