If you have a new ISP, you may still want to figure out if they’re using a transparent proxy on your behalf. This part is not always easy to debug but there is one tool I’ve recommended to verify your browser transmission and the server. If there are inserted and/or modified headers then there is a proxy or tunnel interfering with your connection. https://www.toolsvoid.com/proxy-test/
Otherwise, you are not the first to have this issue. I helped an individual on this forum months ago for the same thing. He did not have any VPNs or proxies either so it was suggested he find the contact info for the IRC admins. If they are not on this forum, you can try the TWiT email address: info@twit.tv.