Losing steps at same place every time

Yeah if you look at the job below it you can see it has a staircase like finish. It was suppose to be a rectangle but it kept losing steps shortening the travel one way and then cutting further going the other.[quote=“StuartPearson, post:5, topic:36942, full:true”]
Is it catching on something, perhaps a bolt head?
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Not that I can see, the only bolts in that area are those furniture bolts that slide into each other in the middle so they stay relatively flat to the surface.

In the video you are seeing a 24in line being cut I am not doing anything manually. I Followed the settings in this video as closely as I could.