I was/am getting frequent dropouts as well. I was at wits end, but I think (or I hope) I stumbled onto something.
I was about ready to uninstall my cohesion3d board and toss it in the trash with it constantly failing on jobs. It was to the point that I would swap out between my m2 nano to do a job and then back to the cohesion board attempting to get it to work. So much for plug and play.
Man, I’v done everything, days and days reading and researching, 3d printed board holder, nylon washers for the screws, drilling a hole in the cabinet, stripping the powdercoating to install a grounding bolt, four or five different usb cables, you name it. nothing seemed to work.
I reformatted my computer and reinstalled windows and lightburn. After this it seemed to work. I got two days of setting up and doing test cuts and whatnot. Last night I decided to do my first paid job with it… 5 seconds in and the machine stops.
The only thing I done differently in those two days was plug my laptop in.
I plugged it into the power bar that my laser is on and maybe its a fluke I don’t know but it stopped the job. I unplugged the laptop from the power bar and put it directly into the wall socket and was able to do the job. 2 hour engrave and 5 minute cut.
I will do more testing today. I need to figure out pwm tuining, I bumped it to 400 but now my brand new Reci 100w laser doesn’t cut through 6mm baltic birch plywood at 80% power @ 15mm sec