Skipping Lines in Raster

Had strange sections skipped in a raster etch of a map I did this morning. Looks like the belt skipped as laser was travelling merrily on its waver horizontally. Happened 3 times on the piece.

We’ve had our laser for about 7 months. Just recently did a belt tightening a couple days ago. Wondering if belt skipping is common or there is some way to avoid this. It’s never happened before.

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