Sounds like the actuator is sticking for some reason. Probably something stupid like one of the rods fell off and is getting hung up. You'd have to remove the door panel to gain access to it, but it's not hard to do.
Remove the tweeter or window sail
Remove the rubber at the bottom of the grab handle and the screw beneath it
Remove the door handle trim
Remove 4 plastic screws/clips, two towards the front and two towards the rear
Grab the bottom of the door panel and give it a good jerk
The bottom of the door panel should pop right off and the top slides up
Remove the connectors to the window/door lock switches and light
To operate the door locks, the passenger switch may need to be connected, even it you use the driver's door switch, but I can't remember for sure.
Good luck
Remove the tweeter or window sail
Remove the rubber at the bottom of the grab handle and the screw beneath it
Remove the door handle trim
Remove 4 plastic screws/clips, two towards the front and two towards the rear
Grab the bottom of the door panel and give it a good jerk
The bottom of the door panel should pop right off and the top slides up
Remove the connectors to the window/door lock switches and light
To operate the door locks, the passenger switch may need to be connected, even it you use the driver's door switch, but I can't remember for sure.
Good luck