XCarve Freezing up after starting to carve

Periodically after setting work Zero (manually) and starting to carve a project, it will start carving and within 1 minute or less, the machine freezes.

I I have to power off the XCarve, unplug it from the MacBook, and even Reboot the Mac.
Afterward, I can do 2 or more projects with no problems.

This happened once yesterday and again today.

Changes - Chrome Browser Update. No changes to Mac or anything else.

Question - I always have 8-12 tabs open in my browser. I do not change tabs when carving.

Any ideas?