I have a Benchtop Pro 24x36 and it runs great normally. I use Mach4 and when I load a 3D carving file with more than 3 million lines of code the machine screams and loses steps as soon as I hit cycle start. I have to close mach and re-home the machine. I haven't been able to run large files on this machine and have to use my Xcarve to do them. Any ideas what the problem might be or can they just not handle large files.