hi. i have a w204 2008. just this week it happened, one of the rear door when auto lock make and additional noise. like a motor to lock the door still running for bout 2 second. instead of just normal auto lock.

how to describe. it's like brrrrrrrrrrr sound when door lock. wierd part it only happen when auto lock when driving. if use remote won't repeat the same symptom.

anyone have any experienced on how to solve this?