It is reported that at certain times when Drivers attempt to release the doors at the station, the Train Management System (TMS) indicates that the beacons cannot be detected, preventing the doors from opening. The location of the train then needs to be inputted into the TMS, allowing the doors to open. In some instances, even this will not release the doors, and trains have needed to be rebooted. This can take in excess of five minutes, leaving passengers on the train without an exit route.