ring doorbell

I started having issues with my Ring in July so i had a new one sent to me. However it is the same issue, the ring 2.4ghz is not connecting to my xfinity router which i had replaced not too long ago. Every other device in the house is working fine except for the ring doorbell. I reset the ring every day, xfinity has tried to update the gateway and troubleshoot but i don't know what else to do at this point. I had a tech come out 2 weeks ago and she replaced old cables thinking it might resolve the issue. I even had ring update any firmware. A ring agent asked for me to have xfinity lower my firewall, wpa2 connect and also create a gas network. They sent me to a 10.0.01 site to select my ring device to a "reserve id". I need assistance please.