try rebooting by holding the two scroll wheels, if that doesnt work....
Try parking the car, going to controls (which is the menu that appears when you tap the car), then service, then "power off". Do this through an open drivers door, then after the car powers off, shut the drivers door and walk away from at least 15-20 minutes. This is basically putting the car to sleep.
One of those two things should work. I put my car to sleep after every firmware update (IT habit), and dont tend to see these type of quirky things that happen after firmware updates.