I've only flew my Phantom 3 Pro a few times. Every video I've shot has been laggy when I review them on my computer. I have a SanDisk Ultra 64 GB microsd card with has a 48mb/s read speed. I have the camera settings set at the highest quality allowed and have been recording in MOV. I've googled and searched this board for an answer but couldn't find anything. Also, does the camera record sound? I don't have any sound on the videos.