Thank you very much. Finally it was a hardware issue. The usb port on the cc121 had not a correct touch stability with the usb cable. I went to the Yamaha service near here, they confirmed the issue and they changed the unit.
Thank you very much. Finally it was a hardware issue. The usb port on the cc121 had not a correct touch stability with the usb cable. I went to the Yamaha service near here, they confirmed the issue and they changed the unit.