After a storm last week, my internet became spotty and unreliable after all devices working perfectly and in-sync prior to this. 

I factory reset everything I do not know how many times.. I called Google support several times, as well as my ISP Xfinity - to no avail. After the reset - the extenders can’t connect to my arris. 

I have 3 Google Nest WiFi Pro - I use one as the router and it is connected to my Arris SBG7400AC2 via Ethernet cable. Now, I have internet through Arris but signal is weak throughout the house. When I try to add a device through the google home app, it displays all 3 Nest wifi devices  , I select the one that I’ve been using and that is connected via Ethernet cable, I go though the promts but when I get to the “connect the Ethernet cable” - I get stuck! Nothing happens.. I also tried to swap the devices to see maybe that one is bad one now - not working. 

I also cannot log in to the Arris admin menu to see if I can bridge it.. I tried resetting, using “password” as password - it just tells me that my profile has been locked.. Just frustrating all around..