Just did an 18 minute flight at a setting of 1920 x 1080 running at 120fps. As is normal the file is in 4 parts as per Microsoft standard. The strange thing is I cannot run the last one of the four files. I have even tried two different file changer programmes TMPEG & Handbrake but neither work . I ran to the end of the battery and only switched of the video record switch after landing.