bourbon alarm fault

Has anyone else had this problem?
After centrally locking my 2020 Bourton with key fob, a few minutes later the habitation door
unlocks, and the light over the door comes on for about 60 seconds.
Roughly an hour, or any time after that a loud beeping alarm goes off and a warning screen lights
up on the control panel indicating that the vehicle battery is very low, which, according to the
battery level screen, it isn’t.
You can only imagine how annoying this is especially when it wakes you up about midnight!
Besides that, it isn’t safe to leave it unoccupied and go off anywhere.
I have taken the Bourton back to Marquis where I purchased the it, and they haven’t managed to
sort it out yet with Sargent, who provide the security system for Mercedes, the base unit.
Mercedes have done an update but it hasn’t resolved the problem.
Has anyone any ideas or useful suggestions?

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