When you deploy the flaps.. the maximun tolerance speed red bars comes down.. so if you are at a very speed.. limit to the maximum you will have overspeed and the plane will climb to reduce speed. These all issues you describe are because bad pilot manouvers. You have to maintain good speeds and not try to reach the maximun speeds, or near the maximum speeds. If you do, you won't have any problem. Of course there will be people that will have same issues but that doesn't mean is a bug. Others are flying the plane without any incidences here, because they fly the plane taking care of the speed they are having. That is why I chose to have the throttles manually and not driven by any autopilot servo.