Is it related to the frequent failure of elevators and the installation of elevator cards in elevators?

It's okay. Because installing the elevator card is convenient for people to pass and will not damage the elevator, the frequent failure of the elevator has nothing to do with the property installing the elevator card in the elevator. Elevator refers to the permanent transportation equipment serving several specific floors in a building, and its car runs on at least two rigid tracks perpendicular to the horizontal plane or with an inclination angle less than15.