Beosound Ouverture doors opening

Have such a problem - when Ouverture glass doors opening I hear a sound similar to the sound of a running motor. The sound is heard at the very end when the doors have already opened. That is, when the door is opened, the sound of the motor is not audible, and when the doors have already opened for several seconds, it is audible that the motor continues to work It seems to me that the motor should automatically stop immediately upon opening, but for some reason it continues to work for a couple of seconds