Dine Out Restaurant Customers Issues

Everything was working fine until one day the customers wouldn't stay to order anymore or the waiters wouldn't take the orders and now the customers come with the stars and then just leave without even sitting down. The restaurant would be opened for hours and not making any money and I am losing money and ratings because it just won't work. Some customers sit down but then they get up and leave or just sit there and the waiter won't come by to take the order. Not sure what to do. Please help!!!