Notification of Unknown device ARRIS TG1682G connecting to my network at 3am

I received a notification via text/email that a device connected to my home network for the first time.  It was an ARRIS TG1682G, which I believe is the same device as my current home wifi box.

I checked the MAC address on the actual box to the one shown in the XFi app for the 'newly connected device' and it is different.

Connection details in Xfi app display 0% activity.

What is this connecting to my wifi network? Should I be concerned and remove/pause/forget this device?  Just appears an odd notification.

Thx in advance