Hello i have a neje with A40640 module and i have the latest LightBurn software all it was perfect without having any problem from today i try to cut and i have too meny stops in my laser and 2 messages (Grbl 1.1f [‘$’ for help])…
(fx��fx) maybe somebody know what is this?
Thanks…
This is often caused by line noise on a USB cable.
Any inductive motor, fan motor, (even an egg beater) running can create this type of RF interference into the USB cable.
Short shielded cables with Ferrite beads are the usual good solution.
Have you changed any of the equipment positions, locations or cables?
New Usb cable
Please test the old cable and report back. 
hello again i chage the usb cable but i have again the same message and stop my laser
In LightBurn, with the Console window open, look for an Error message or something that would indicate why the engraver stops.
If you do see an error message, please Copy and Paste about 10 or 12 lines on each side of the error message into a reply here. I’d like to see what is happening.
Ok i make this tomorrow
Thank you
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