I have purchased a Bosch dishwasher – model SM150C12GB. Towards the end of the programme, on watching the timer counting down, I assumed it would go back to 0.00 when it ended. But when I went back to look shortly after it had finished, I found the dishwasher had a blank “time screen” and had switched itself off automatically. Is this correct? All previous dishwashers (Bosch) have left the timer at 0.00 so I know the programme ended correctly.