I might be wrong but I think some of the ambient lighting reverts back by default.
Sport mode for instance is red by default, so if I change mine to say blue, it will revert back to red the next time I start the car.
I think Comfort mode might be the same, its a blueish colour by default and reverts back to that after restarting.
I havent really sat and played around with the ambient lighting that much so I might be wrong.