All, 1965 M20C. My flaps will not hold pressure. Aerodynamic forces, or even spring pressure, will retract the flaps with the switch in the down position. My preferred aircraft mechanic is planning on looking at it in the next week. According to the maintenance logs, this issue has been addressed at least twice before. In the meantime, does anyone have any experience with this issue? Brakes work fine. Flaps extend and slowly retract. If I extend them prior to takeoff, they are fully retract