My '98 Suburban started having door lock issues recently. The key locks and unlocks the door from the outside. The fob unlocks it. But the fob will not lock it even though I can hear the actuator working. Inside, if I press the Lock button on the door panel about 8 times, it will lock. I figured the actuator was bad (25 years old truck....) but it still doesn't work with a brand new actuator. Could it be the actual latch assembly inside the door? Help!!