Thank you for your reply and your tip!
The rover did not turn when scrubbing through the sequence. Everything was fine. The problem only occurred during the rendering process.
I found out that the flipping only occurs when I have not rendered the scene from the beginning. In other words, I set the green locator to 200, for example, to avoid rendering unnecessary frames. If I leave the green locator at zero, then the rendering is fine, as you can see in the video. The problem is that I have to render all frames from the beginning, even if the interesting part for the camera starts at frame 500, for example.
Many thanks and greetings from Vienna!
Reinhard