I ran a 3D file today and have a piece of kindling to show for a couple hours of work. The piece is not large 8" x 8" x 1" thick. The roughing toolpath ran fine. The finishing toolpath was fine until about 60% through. Then the X axis started to gradually wander to the left. I've cut many 3D files in the same way without a problem. There are no obstructions, the cut was very light, about .03". The travel speed was 200 ipm. I've cut faster without problems. I ran a 1/8" ballnose at 12K.
My machine is a benchtop with a 4G upgrade and I used Aspire to create the cut file.
What could cause loss of steps?