You say it like it’s not relevant, but it is. Connection stream is solid smooth.
Rather indicative that it’s a Twitch API server side issue.
I’ve already ruled that out as a possibility, but there are no antivirus or script blocking something. But when I’ve got a consistent stream playing the video streams I’m watching don’t even get interrupted with buffering, it’s always the chat thats getting interruptions. Because it seems apparent that the chat stream is needing more bandwidth than it is necessarily required to be stay connected.