Just received my PV2+ back from the dji authorized repair center. They had to replace the NAZA flight module. Unit was a few weeks old. When I received the unit back, I could not get them camera to connect to any of my iphones. I did not have a green light on the camera and there did not appear to be any power to the camera. Sent it back the next day and it seemed to work at the repair center. Received it back a few days later. I took it out of the box and had a green light on the camera and it worked fine. I did not fly it at that time A few days later I was going to fly, but same problem. No power to the camera, no green light. I still have not flown it and no green light or power to the camera. Any thoughts?