Update: I had increased the plunge rate to something like 3x the default and f6or problems.
I changed it back to default and now it’s cutting regularly. Thanks everyone!
(can’t upload the example video)
Cutting 4 simple pockets on MDF, .25 endmill, 2 pockets done. On the 3rd pocket when it plunges the Z skips and doesn’t go any deeper. It makes the path (though not cutting anything because now it’s too high), and when it comes time to plunge again, the Z skips again as soon as it touches the stock and doesn’t go down.
Stopped the project, went back to CC and picked the 2 remaining pockets. Re-centered, re-ran, same thing.
Any idea what just happened?