The likelihood of this being a hardware issue is almost impossible. This sounds like a turntable calibration issue to me. Please read this article and be sure to follow it's advice.
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Got my second S9 in the mail and it does the same thing the previous one does. distorts in the green and yellow when playing a track. As soon as i play through internal the sound clears up.
Documented it in a video that you can watch in the link below. Love the mixer but def want this fixed.
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The likelihood of this being a hardware issue is almost impossible. This sounds like a turntable calibration issue to me. Please read this article and be sure to follow it's advice.