Doing a small test print of some curves on non- 4mm plywood. During the first task (engrave) the head stopped and the button turned solid purple. No indication of anything on the UI. In fact, the UI continued as if it was still printing and eventually said it was done and I should wait until the fan turns off before opening.
Here is what everything looks like:
(Head is stopped, fan is blowing. The black things in the corners are magnets, could that cause weirdness?)
(A truer representation of the purple)