As a @YouTube red subscriber, I’m not really sure why I randomly start seeing ads on videos. 
This happens to me as well. While signed in my primary acct that has YouTube Premium. It happens more often when a cast to my Chromecast. Maybe 1-5 times a week
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Thanks for the details. We recommend getting in touch with our YouTube Premium support team: https://yt.be/help/purchases . They'll dive into this further with you. Hope this gets resolved.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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