Popping sound


My MC12000 has recently begun making popping sounds when embroidering.
I am making the Hoopsisters mystery quilt using the SQ23 hoop. Each time the machine crosses a certain point on the horizontal axis it makes a popping sound. Stitches seem to be fine. No popping sounds on the vertical axis yet. My dealer said not to worry about, but it still concerns me. Am I harming my machine by ignoring this warning sound? What could be causing it? TIA.
Mary in Savannah, TX

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