Interior courtesy lights, headlights and door locks

Went into garage and headlights and interior lights were on.   Car had been turned-off for hours.  Headlights were set on Auto which I turned-off and other lights went out.  A long story short we check on the car to find the inside lights on and off  and not knowing how often it is doing that.  Then the door locks starting going on and off while driving.  The Lincoln dealer checked the car with their diagnostic tools and could not find anything but suggested a new Light Control Module would be the most likely.  They cannot get the new part so our other garage got a used one and installed it yesterday (I kept the original) on the way home the door locks started up again but hoped that was a different issue.  Came out to the garage and head lights and interior lights were on again (not the module).  Unhooked the battery called the garage and they are  going to research further.  HELP!