I think that you misunderstood Doug when he told you to step outside. He didn't mean to look outside of your door for anyone. He meant for you to look around at your neighbors homes to see if anyone appeared to trying to get into their own home. Maybe somehow they are activating your doorbell from there own doorstep when they ring there own bell. He advised changing the DIN codes. I know nothing about doorbells, so can't help you.