I've been running an MV-R1200 and MV-R2400 for the past year with no issues on my part but 2 months ago we had a PM schedule done on both machines and after they were done the machines started moving on the U and V axis even while doing straight cuts. One machine moves within .00012-.00029" while the other machine moves .00086-.00202" in the U and V axis using the same program. We have made multiple different programs with linear movements as well as arcs and it stays consistent between them. We compared the programs we ran before the PM schedule to the ones we are currently running and ruled out post-processor issues. The U and V movements only occur on the contour passes, if I program a part to pocket and then contour, the pocketing portion has no U and V movement. We run our parts using only 3 contour passes and watching it run we noticed that the first pass which runs clockwise has the largest value, then the second and third passes run the same lower value.