Not the same manufacturer, but I have had others that lose their safeties momentarily, which stops the car for a second which has caused the doors to cycle because of the safety loss. Then the open limit is seen by the PDO/controller and triggers a reclose, and a restart of car motion. Not saying this is what is happening here, but food for thought. So if its happening at the same point in the shaft, it could be a trailer wire. It could also be a bouncing of a safety switch too.