Not that this is what you want to hear but, I have the same problem. will your car relock the doors if you only open a rear door and not a front? It seems like the computers do not know the the rear doors are open. I was thinking that this might be a door lock actuator but, to have both set of contacts go bad at the same times seems unlikey. BTW the door lock actuators have contacts that show what the door is doing inside them.
BP