Laser freezes as lightburn goes on

I’m having the same issue…
Arduino CNC shield with GRBL 1.1 and NEJE 5W laser module running Lightburn (latest) on a macbook pro 2010 with high sierra.
On the fill engraving mode the laser freezes arbitrary and Lightburn keeps on going, then sometime the software also freezes…
Already try everything except using lightburn on windows, but from read the comments above maybe there is no need for that.
If someone get a fix on this issue please share.

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