Machine skipping

Has anyone had a problem with your machine skipping. It will be cutting then it will make a funny sound. I stop the machine raise the bit, then hit the return to starting point. It is like one inch off where it started,

Have you checked to make sure your ball nut is clean and oiled? Also, run your hand along your guide rails to verify they are smooth and debris-free. If they aren’t, clean them with 0000 steel wool and coat them with oil after.

Thanks I will check. I see others have had similar issues.