Camera problem

Hello,
During the flight, the camera of my Phantom 3 standard turns backwards.(flips over)
On my phone i see then the gimbal instead of the landscape.
When i turn the wheel on the remote control, nothing happens. The camera stays in that position. When I manualy turn the camera in the correct position and start flying again, the same happens again. Calibrating the gimbal dousn’t work either. Please advice!
(sorry if my english is not so well, i am from the Netherlands)