cm1000 and xfinity issues

Got the CM1000 and swapped out the comcast router/modem combo. Comcast had it working and then BOOM within about 50 minutes before I got finished setting up my airport time capsule and airport extreme I lost internet connection. 

I got an Xfinity guy in my house right now trying to figure it out. He says comcast is sending signal but clearly I don't have interent other then the hotspot I am using from my ipad right now. 

I have read a ton about CM1000 issues on this board and other places. Most of those issues are from 2016 with the CM1000. 

Darren, can you or anyone tell me what I need to do to get this to work again. If I need to get a different modem I will but I would like to get this to work since it seems to be the best and fastest and scaleable. It makes no sense it worked and then stopped. PLEASE HELP ME!!!