Power Door Locks

The driver side power door lock went out and I had to get the actuator replaced. Now the front passenger power door locks and the back driver side power door lock is out. So three of the four power door locks have gone out. I assume that the actuator needs to be replaced in all doors. I am wondering if this is a parts issue (faulty actuators) or an electrical issue involving the actuators. Could this be a symptom of larger electrical issues that I may experience later on down the road? Thanks! Mark