Hey guys.

Thanks for the responses:
Apologies, looks like i uploaded an incorrect file, i have now edited the original post with the correct file: CNC Test-20170304.txt

The machine ran from the centre circle 6, outwards until circle 2.
I noticed everytime the machine was doing a circle it moved to the centre and worked its way out - I know i set the design up wrong.
At circle 1, The machine lifted off the Z axis zero about 2 inches, then went to start the Outer circle (which was a full through cut (with 1mm extra). At that point it went off on a tangent, which looked random, i would describe it as jumping.

Judging by what you guys have said about feed rate, do you think it was:
1. It went from foam board into MDF so was a bit tougher
2. The feed rate was way to high for the depth it was cutting at, so it jumped.

I know the machine definitely lost position, because it didnt go to the correct home position after.