If the ignition stays between "START" and "ON" positions it could cause loss of certain electrical functions.
In the affected vehicles, the ignition key (FOBIK) may not return to the "ON" position after being rotated to the "START" position, instead sticking between the two positions. Potentially, while the vehicle is being driven, the ignition may inadvertently move through the "RUN" position to the "ACCESSORY" or "OFF" ignition position, turning off the engine.
What to do: Book it in at your next service. There is no deadline and no charge.