MacBook starting up. lots of?

I have a NEJE, switched to Lightburn because it was a recommended product. I have it loaded, I am CAD trained so I can figure out design, art, symbols, etc. I can do quite well at this.
then I want to engrave. Problems getting it to drive my NEJE on a more than unregular basis. Drop the NEJE out, engraves 3 logos, then lost device. Can’t stop device busy action.
Just what did I miss on getting the results my BFF gets on his device? Any help of tutorial would be appreciated.

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