Power Door Locks Not Working problems of the 2003 Infiniti FX35

Power door lock actuators operate intermittently. There has been several instances having the rear child door lock engaged and we could not open the rear doors from the outside because the actuators failed. Children had to exit out the front by climbing over the front seats. While at a parking garage a large vehicle parked close to the passenger side of our car and could not open doors to re-enter. Again, intermittent operation of power door lock actuators , both front and rear driver side door locks failed. We had to enter the vehicle through the rear tailgate/hatch. Took vehicle in for service and lock were operating at that time and manufacturer recommended replacing the door lock actuators. Still to this day the locks operate intermittently, and now have 115,000 miles.