96 EX V6 Door Locks won't stop locking
 

96 EX V6 with 160k miles. For awhile now when we lock the car all the door locks kept trying to lock for multiple cycles for a few seconds. The problem is now worse - they keep locking for over a minute now - all the doors. This has to be really hard on some component(s) - as well as drawing down the battery and just plain annoying. I'm reading this is probably a door lock actuator problem but it can't be all 4 actuators going bad. Will 1 bad actuator - or even something else cause this problem? Thanks.