I have an issue with my door locks on all 4 doors. The lock often only comes part way up. If I push lock and unlock a couple of times, it usually unlocks the problematic door. When I use the key (rather than remote), it always unlocks the driver's door but doesn't always unlock the other doors. Is it the actuator? Do I need to fix this in all of the doors?
As always, thanks for the help.

Chris