Hi everyone I am having a little trouble with my workbee 1010. I have been engraving and cutting Charcuterie boards out of 1 inch Walnut. Everything was going fine cut out 22 boards and my machine started to vibrate real bad ripping the board of f the spoiler board. I had no problem with any of the other boards so thought I would change bits maybe the bit was dull but did it again with a new bit. First bit for the 22 boards I was using a 1/4 inch downcut and then switched to 1/4 upcut same issue but was able to stop before it went wild again. Any thoughts?