Hi, I have a 2013 Mercedes Vito Taxi 62 plate that has an intermittent issue with its sliding doors. Sometimes when I pick a passenger up and close the door the door that has been opened is reported to be still open on the dashboard and the buzzer sounds. Sometimes it's a case of opening and closing the doors and all is well - lights turn off and buzzer stops sounding. But just lately, I have to open and close the door a few times to get the buzzer to stop and the lights to turn off. Also, once the door buzzer is sounding and the door open is showing on my dashboard display, the central door locking system seems to be knocked out ie. the brake pedal doesn't lock the rear doors and the light on the dashboard for the central locking system doesn't light up. Has anybody had a similar problem and what have you done to remedy it? Is it a central locking problem? My key fob never fails to open or close the Vito btw. Does it need new sliding door contact plates on both sides? I clean them regularly.