Reaver

I know this is old but just factory reset the all in one and then boot it back up look for bridge mode click enable and reset after the connection comes back. This is true bridge mode but I have called Comcast and they did everything on their end but it didn't go in full bridge but it will work just fine. I have the XB3 dpc3939 though if you have another model the bridge should work right on my old on it did you will know it works it you can only use port one on the back and no others. I had issues in my area but if you have random frequent resets then I would say take the bridge off and use the dmz like he said.