@waynehuish Please post your config.g and the repsonse to M122.
Do you mean you have recently updated the firmware on your controller board? What version were you running before, what are you running now? Which Duet board? Is your machine something like an Ooznest Workbee?
If it's to do with the firmware and the V-carve software Ooznest provide, you would be better off contacting their support.
Ian