Hi Sombunya: You might find it interesting to read my post at LP Rip with Distortion at the end of side one
In there I have written:-
@otwo_pipes:
I have heard distortion when I started ripping, not severe distortion but certainly audible, just like sibilance. Not knowing what to do I just pressed Audacity Stop followed by Record and the sibilance disappeared. I do not know what this says.
and quite a lot more. In essence I think we are experiencing the same problem 