Yesterday all my finished projects involving a step down started moving a small distance in the x direction before each step down. For example, if I am cutting a circle on the CNC machine that is cutting 1 inch deep with four .25 step downs, it will cut the first revolution of circle cut correctly, but it and hits the point to drop the Z level down .25, it first moves over slightly in the x direction before beginning the Z level drop. What could be causing this? It is now affecting all my Gcodes that were working correctly until yesterday.