Unknown Device Connected During the Night
When I woke up this morning I saw a message that a device had connected to our internet for the first time.
The device was a router, the same type as ours, but the MAC address was different by one digit. (My router's MAC address ends in 8, the one that connected ends in E)
The device disconnected while I was looking at its information on the Xfi app and has not connected since.
The IP address is unknown.
The device is an ARRIS TG1682G
It listed 0% network activity.
Is this a security problem? Is it a fluke? Is it a weird way my router is updating and should be ignored? Support is impossible to reach right now.