Laser taking off and dragging

Hey guys I have a 100w Co2 laser and while it is running a project it will randomly decide it wants to run away while filling and the laser doesn’t turn off in the process. Any ideas what causes this?

I also find that when it runs better it sometimes comes out clean and sometimes with little dashes between the fill letters.

Any help would be much appreciated, I am new to my 100w Co2 laser and I’m sure this is an easy fix. Thanks

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