I had this happen 3 times in a row. After dismount, the board takes off at full throttle until it either hits something or flips on it's side (which finally disengages the motor). I emailed Support and eventually sent it back. They ran it through their "17 point" inspection process and proclaimed it is fine and in good working order. I have been asked to pay $80 in shipping costs as they did not find anything wrong. I will pay to get my board back and will video the dismounts in a safe environment and hope the issue has sorted itself out. If it has not, I will let the company and all of you know.
For those of you who have experienced this situation, I understand how scary it can be. In essence, your board becomes and 15mph land missile and shoots away as you watch helplessly. I believe it poses an extremely dangerous situation and hope that the Company can pinpoint the cause and finds a solution.