Hi which version of the iDrive software do you have? I recently had my car in for a recall in the UK and during the recall they applied the latest OS update which was July 22.
On driving the car home driver assistance also seemed to have vanished and the mode button would only let me select speed limit, heads up display also wasn't functioning with anything but basic info, no satnav etc nor was the dual display for apple maps in car play.
After driving for about an hour everything just started working again, not sure whether bmw does some sort of online check for features for the vehicle then enables once complete or whether the OS had to discover the features of the car itself. Its been fine since.