This is definitely a Driver issue for me.
When I rollback to 17.8.1 the issue doesn't happen. This is the driver that is specifically released with the Quake Champions optimizations, so this is the one that I am staying with for now.
What is happening is that when I load netflix with any browser, netflix stutters every 3 seconds for 1/4th of a second. It stutters the entire system, not just the browser.
This still happens with the newest driver. Tested an hour ago.