Over the past couple of days, a few devices have shown as connected to my network. I am unable to remove or "forget" them, as they show as being connected to my gateway via Ethernet. However, the gateway is in my bedroom, and there are in fact zero wired devices connected to it. Obviously, these devices are neither mine, nor are they connected via Ethernet. This makes me concerned for my family's security.
How can I rectify this situation? Does my gateway need replacing/swapping? (Is a swap even possible during this "shelter in place" situation?)