I haven't confirmed that it's the actuator. Recently it started buzzing and won't lock. When I lock it manually it has more resistance pushing it down unless I use the interior lock button or my remote lock. Also, the aftermarket part is a lot cheaper than an OEM actuator.
My Driver's side buzzes every time I lock it. I looked for another and found even the aftermarket OEM style was about $280. I am thinking about putting universal door actuators but don't want to lost the ability to lock and unlock from the switch on the door. (trading one problem for another) so for now, i just live with the buzzing.