Has anyone ever experienced this before? W204 well over a year ago this happened. Unlocked car as normal after driving it somewhere and it had sat for around 30mins. Put key in ignition and nothing! Turn the key, nothing. Locked the car and unlocked tried again and nothing. The car then makes the servo sound ( assuming this is the steering lock or something deactivating) and bang it starts. This hasn’t happened since. Today it happened again. It’s like the key has nothing to do with the car other than fits in the ignition. Turned off a few times after this and it was fine.