I have not had to contact Comcast since I had my own router replaced with the combo. When I did have my own router, I was able to have a tech come to my office

I have not had to contact Comcast since I had my own router replaced with the combo. When I did have my own router, I was able to have a tech come to my office and identify the issue (which involved cutting my router out and testing) Even though it was my hardware that was at fault, they did not charge me - probably because I opted for the combo? (not sure) The combo router is not cutting edge - however I don't need cutting edge router technology at my business - I need reliability. We have two people in the office so our needs (even though we work "on the web") are not that great. Check with me in a couple years, when my combo modem/router is even older and I need/want an upgrade. I'm not sure of that process - anyone been through that?