1998 Dodge Caravan Power Door Locks

My driver side power door lock does not always open or lock when I use the key fob or door switch. I hear the actuator working and all the other door locks work fine but the driver side door lock only works some of the time. I have to manually lock or unlock it with the key.

I'd like to know what's wrong and if this is an easy fix I can do myself or if I should take it to a mechanic.