Hey! That’s a frustrating issue. I’ve had a similar problem with my ATS. It sounds like it could be a problem with the door lock actuator or a wiring issue in the door. Sometimes the wiring harness can get pinched or worn, causing intermittent issues like this. Another possibility is the key fob battery being weak, though it’s less likely if the other doors are working fine. I ended up replacing the door lock actuator, and that solved the problem for me. If you’re handy, you could try checking the wiring yourself, but otherwise, a visit to the mechanic might be in order.
