When I bought the DJI the Phantom had no issues. Now I installed a gimbal underneath it and did the firmware update. When I want to start flying it will always blink yellow for about 3 minutes before it starts blinking red and green. I can do nothing during these 3 minutes. I saw something that it could be that the phantom is warming up. But that's weird because before the firmware update and gimball placement it was ready in a few seconds. Does anyone know what kind of problem it is? Thank you.