Did you disable all the power managements including ones for the USB? Also did you save your previous settings from the J-Tech LaserMode grbl and send them to grbl 9j? I leave the Windows Defender program active, but disable the Auto scanning.
If you are running BobCad/Cam, you need a Post Processor for grbl. It may be adding commands that are not compadible and could lock grbl up. The G64 should not be added as it will effect the feedrate.
It sure looks lean and mean now.