Same issue and the camera got a 10 degree tilt to the left that is intermittent. Calibrated the gimbal, no fix. I was in the desert near Rachel, NV so no Internet for a hundred miles around. First flight (~20 mins) was perfect. Second flight on the camera would tilt left and then level. A couple of times, it would noticeable tilt level hard, then be stable for a minute or so before doing it's tick again. Flying straight forward it would drift left a little. I was using the VR Headset and the heads-up display was showing a 10-11 degree tilt left. Flying the drone right in front of me, the drone was level, the camera was rotated left 10 degrees. Calibration did not fix. Will have to check it when I get home and try the firmware update and IMU calibration if it is still happening. It was 100 degrees in the desert so maybe it was heat, although there were no warnings in DJI 4.