Hi,
Thanks for your reply. I've actually moved the thread to Mavic Help but couldn't figure out how to delete this version. I wasn't in Sport mode, and it was actually only just starting to accelerate. See the video in the duplicate thread. Got up to about 7.5 m/s. However, what you say does make sense. Could be a combination of yaw and the braking? Just trying to establish if I have a fault, and the weather here isn't making it possible to try again for quite a few days.