Help with smoothieware and lightburn

Hi there after some help, just upgraded my laser to a smoothieware firmware and trying lightburn, the laser stops at random lines on most projects, after reading some info was mentioned about the grounding issues from floating usb sockets to which i tried the recommended fix but never worked, tried other usb leads but the same and even tried the dpi to 54dpi but al still the same, in the console box when it does stop it says job completed

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