Me too - I’ll go have a look if it’s available to the group. I have a Fluid NC board here but - not installed - no drivers.
Your profile says Arduino / CNC shield in your K40. Also interesting.
If the problem now exists outside the one engraver I’m starting to consider the Pulse Length $0 and Step Idle Delay $1 settings as something that could have transfered between machines that may contribute to stacking-up of small cumulative loss.