Please help with p3p no gimbal connection

[rgf1526]

I have a Phantom 3 Professional that when its on give me a D-D, D-D beeping, tried to install latest firmware and didn't take. On the app it shows that the gimbal is disconnected. For a while I had no image coming from the camera but I now have video transmission but no gimbal control. Also when I try to turn off the drone the red light stays on until I cycle the battery off again. Now my camera moves randomly on its own. Please help.