I have exactly the same problem on my 2016 L405; I'm going to be making an appointment at the dealership to check it out.
Absolute pleasure - I've just posted a solution to my current issue too.........Byreman. I dont have this issue but thank you for coming back and posting the solution. One of my pet peeves is people posting questions only never to be heard of again until they have another issue that they need help with. Glad you got it sorted for zero pounds.