totally baffled now .......

well this central locking/keycode/non start or starts when it feels like it fault is getting weirder, today i checked all the wires going into the becm found they look all ok, stripped back all the door loom nothing obvious found,earlier in the week i fitted a spare drivers door outstation i got from ebay it started smoking 5 secs after it was fitted,so i gave up, but today when i was pottering around the central locking popped up, deadlocks released and engine started, so weird, the black wire on the drivers door actuator looked dodgy the second i disconnected it the central locking locked i renewed the cable and eventaully got things going, left the vehicle with the locking all working and things normal, the rf receiver is disconnected and i have no key fobs, if anyone has any ideas on what this gremlin could be please let me no as i`m baffled.
cheers in advaNCE