Almost all air blowers have an automatic drying cycle that starts 20 minutes after using the system, but consider:
If a power failure has occurred, the drying cycle can start on its own.
If the system is equipped with a water sensor, the drying cycle will start whenever there has been water in the bath (after a shower, cleaning the bath, etc.).
If this happens often, even if the system has not been used, contact your dealer, the keypad may be defective and need to be replaced.