Cisco Cisco DPC3939: My power went out now my Xbox won’t connect to server

It's a Cisco brand and model number is DPC3939

I'm using a Cisco Gateway, Device Type XB3 / Model DPC3939.

No, they were separate. Cisco DPC3939 XB3 is the Xfinity router. I just did a factory reset on my Xbox One, also reset my routers to factory settings. Put the Xbox One ports back in, now installing my games and will see if that did anything.

I recently (just before X-mas) switched over to Comcast business (Tier 10up/25down) and they set up this router DPC3939B and I've had random disconnects...very intermittent...could be 5 min. or could be 20 min. before disconnect from Xbox live.

I just had the Comcast technician come out and explained to him my issue and he seems to believe it's an issue between Xbox 360s and Microsoft (possibly update related). Technician checked the line connection (at wall and bldg.) and reports there are no
issues with line. All reports great.

I'm connected directly to the router just as the desktop. Have absolutely no issues with the desktop or any of my other devices (Xoom and cell phone) that are connected via wireless. WTF!

I've checked settings within router...nadda. I've power cycled Xbox and router...nadda. I've made sure ports are open, NAT off, Firewall off etc...Nadda.

I'm heavily leaning towards a recent Xbox 360 update that has possibly borked as is the technician.

The Hitron is the primary router. My cable is connected to it for fast download speeds.

Arris

-Hitron

-- Xbox One, PC, Xbox 360 (All share one cable.)

-- Cisco

The other cables are connected to Cisco.