My new Phantom 4 had problems right out of the box. The SD card and camera gimble will not lock in. I sent two emails to DJI support and had one chat message with Mark. Mark promised me that he would send me a return label by e-mail. No label or no email replies for two weeks. I am not too disappointed. I fixed the SD card with an old lever arm from my old RC flying days. The lever arm pivots from the screw that holds the cover on. The arm pivots over the SD card and holds it in. The camera gimbal works well if I hold the gimbal level with my finger while the Phantom is warming up. I repaired the gimbal by gluing two Lego pieces on each side of the gimbal to keep the gimbal from falling too far left or right. All works well now. 
