I recently purchased a 2017 500e, and whenever the head unit is on, every 15-45 seconds I get a double ding that doesn't seem to correlate with anything I can discern, nor does it correlate with any lights on the instrument cluster or warning on the head unit. I can't find any information in the user manual or online. I would love to know what my car wants from me and how to disable this feature. I thought it was a lane assist, but I've gotten it parked in a large open driveway; it can't be proximity to a charging station or too close to another car, I've gotten it while parked.

Does anyone know what the mystery beep is?