I shot some footage in the 720 24p mode as opposed to 24PN and the files' audio drops out after about 10 seconds. It plays for a bit then just cuts out. The base format is technically 720p 59.94. Can't figure this out. I downloaded it several times, several ways and tried playing in back in 23.98 timelines as well as 59.94 timelines, identical problem. Any help?