Errant lines when cutting

Just getting started with new Ruida 80w Co2 laser after upgrading from a K40. I’m having an issue with unwanted lines being cut in the designs. Lines are horizontal and unpredictable. I’m attaching a photo for reference We have tried adjusting cut speed and then examined all the pulley connections. After finding and replacing a missing set screw, the lines occur less frequently but are still happening. Any suggestions on what to check next?

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