Ortur LM2 starts work but does not finish it

Good morning. I am a new user and have recently purchased the Lightburn license. Beautiful software, but I can’t get the job done because the laser stops randomly and to make it reconnect I have to turn it off and on again. The same thing also happens with LaserGRBL. I changed the motherboard thanks to Ortur, I grounded the frame, I changed the USB cable but nothing. Very often the laser stops working, causing me to ruin everything. You can help me? Thanks bye

Type $$ in the console and press enter. Your controller will respond with firmware settings - copy those here so we can see them.

ALSO

Type $# in the console and press enter. Your controller will respond with gcode parameters - copy those here so we can see them.

Bonjour
J’ai exactement le même problème j’attend le retour d’Ortur.
Si quelqu’un à une solution je suis prenneuse.

Merci d’avance.

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