I have a duplex Miprom 21 Ultrons that will randomly drive into the overhead. If the car is sitting at the top floor it will drive up onto the final. Any floor below it will drive up then NTS stop and put itself back into service. I did read about a chasing software fix from KONE/CETEK. Does anyone know if this applies to DC Miproms as well as AC miproms? I have actually seen these cars do this with no hall call or car call wires attached. Shocked that this happens. Thanks Mike