I keep trying to run a job on my Nomad. About ten minutes into it I get “GRBL Error Serial Port UnknownError”. It did it twice and I went back into mechcam and redid the CAM file. Tried it again and the same thing. It doesn’t happen in the exact same spot each time.
The problem isn’t the CAM file, it’s more likely a USB error. Suggest you contact Carbide3D support though, this isn’t very common with the Nomad (much more common with the SO, which uses the same controller)
I had this problem with me SO3XXL about a week ago. I had the USB plugged in to a port on top of the computer and all I did was move it to a better USB port on the back of the computer. Hope this helps.