MA2 shaking suddenly in flight (Gimbal problem ?)

Hello everybody !

After a few quiet flights with MA2, something inexplicable happened today: in flight, at sudden stops, at that moment the video image has a sudden up and down movement for a fraction of a second, then returns to balance. When I resume the flight in front, the image is smooth, without problems. The gimbal responds to commands without problems. When I suddenly stop the drone, the one shaking up and down again appears … This behavior is also when moving backwards, when braking suddenly , in manual mode and in sport mode. Can you help me? Thank you in advance !