I continued trying different strategies in Fusion 360 to see if I could figure out what was going on. Not too scientific but this is what I came up with. Studying the paths, I discovered that the GRBL errors came while the program was moving the head from one place to another. I looked closely at the path and saw a weird little curve.
This was related, I think, to the stay down distance in the linking tab. This were my settings when I was getting the error.
I changed them to this (trial and error):
and I got this:
No more GRBL errors. Don't really know if this means something to someone. Just posting my findings in hopes of making things better for everyone. Will send this to the Beta team also.