Correct. The car has this start/stop function, when its warm enough, and barely consume any electricity, the engine shuts off to save the environment and the world (EU regulations?), while idling. Then normally when I touch the gas pedal the engine starts again, or since the car itself is still on (radio, lights, etc.) and the electricity gets "low" it will start the engine itself.
Then, often when I leave the car on and idling, gear in park, and seat belt off, and I return after a few minutes I often get the message to start the car manually. Probably some kind of safety feature. The car have a normal key in ignition, no keyless start. And in this situation I only were away from the car for like 5 minutes.