Why does my Shapeoko pro go off course

Several times recently I will be doing a final perimeter cut and the machine suddenly veers to the left ruining the project . Photo attached. Can someone clue me in on what may be causing this

Are you cutting a slot just as narrow as the tool?

There’s a new “Cutout” toolpath for this:

in the current beta:

I just found 4 loose screws on the Z axis rails. Would that be enough to make the machine veer to the left??? What are your thoughts on this?

I would think so. Maybe time to check all fasteners to be sure.

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Of course, any advice other than checking the machine assumes that the machine is assembled correctly:

and clean and well-maintained:

https://carbide3d.com/hub/docs/maintenance/