Just disconnect the battery for 15 sec to effect a reboot.

 

My issue is with a Bouncie device that provides real time monitoring of location so I can track the car. The device is operational all the time the car is running and as it warned me the battery was low I assume it works while not running. Disconnecting the battery every time I park seems unrealistic. As this does not happen on any of my other cars this seems like a problem Jaguar should have resolved.