jonkovach, I had somewhat of the same issue. I moved starting pint to the center of the project and this ended my issue. I do no why it changed, but it has. I have since cut tow or three times starting at the corner again and have had no issues. Again, I can not tell you why. Since those issues, I now do an air check before I cut anything,
Just one other thing I did, as I was doing the carving, I marked each time it would start the problem. I found it was always near the center of whatever I was working on. I hope this may help. I know this does not give you any reasons why. I use a different machine as well. So may not help you at all.
Gooo luck to You,
Tagwatts1 from Utah