This message most commonly pops up when something is restricting the gimbal movement at start-up. Sometimes it can happen due to a filter installed or taking off from a surface which is not level and which has some interference with the gimbal unit at start-up. You can check if anything is restricting the gimbal when the AC is in OFF condition.You should be able to rotate the gimbal with zero friction. See if there is any dirt or debris stuck somewhere. I have no experience of flying under such high wind speeds and hence can't tell for sure if that could be a factor too.