Oh,what a wonderful piece of $#!?.
So,here goes.
The customer,or a bored security guy,says the car stops when not called on floors.
I found that the car parks at the 5th floor.
The security guy goes to the 4th floor and then wants to go back to the bottom floor.
But the elevator has a demand to go to the 5th floor to park.
It goes up there,parks for about 30 secs without opening the doors and then continues one to answer his call.
I told them it was a design flaw.
Really hate bored security guards.