I really wouldn't worry about it. This involves a tiny number of people, and of that tiny number, most probably caused the issue by an accidental push of the button. I was curious though, so I called the service manager at my Mazda dealership yesterday afternoon, and he's never heard about this issue. He called two other service managers in the area, and they hadn't heard about it either. My service manager did tell me that he did have one customer with a locking mechanism failure, and the dealership replaced the locking assembly.