Intermittent Outages with Xfinity Router

I experiencing intermittent connection issues consistently for the first time with my Xfinity modem router since I installed it almost 2 years ago. I am unable to access the webpage regarding equipment management (https://www.xfinity.com/buy/plan/addon/equipment) for the device which I am currently being billed for renting. On an earlier chat with an assistant they were even having difficulty seeing if that modem was establishing a cable connection. I have now re-activated that modem and am getting service at the moment, but even after the new activation I lost connection multiple times just within the last 30 minutes.  I could try another chat, maybe they will find an issue with my account next time...