Our machine is cutting out of square.  Our cut accuracy test samples are good in the x and y, but the corner to corner measurements differ by as much as .020".  We contacted tech support a couple weeks back on this same issue and were instructed to loosen the 4 bolts on each side of the gantry and re-home the machine.  We've done that exercise about 8 times and it has helped a bit, but we are still not dialed in.  We need to know what the next troubleshooting step should be.  Thanks.