Using the volume physical buttons. Doing the same on my s7 on YouTube with the same video, same time within the video. No issues on the s7. Or any other audio producing device I own. From TVs, monitors, speakers, car stereo, other old phones, other new phones family have, etc. The slider on the S20 doesn't seem to have this issue, but I haven't really had the time to properly check. Too sleepy right now too.
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