Inconsistent conmection

Starting over the weekend there has been times where the internet will go down for up to 20 minutes at a time. I was sent a new router by Cox and it has been happening since then. I am unsure if it is because of the new router or if it’s a coincidence, but it is hindering my ability to work from home for my job. No outages appear on the outage page either. Very disappointed in this.