The M61 has an elevating seat. There is a speed limit switch which consists of 2 magnets that make contact under the seat on the seat post. If the 2 magnets are together then the chair thinks the seat is all the way down. If the magnets aren't touching it activates a safety feature in the controls which cuts power to the chair by 50% hence drives real slow. Try lowering the elevating seat down through the joystick controls. If that doesn't fix it then either the magnet switches on the seat post came unplugged or broke.
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