I have a problem with a Sony MZ-NH1. It will transfer about 8 albums onto a 1gb disk by using sonicstage or simple burner, but will then refuse to transfer further tracks. During this time the unit makes clicking noise. To clear the fault requires a PC reboot or disconnection of the device from the USB cable. I never have any problems with play back, and it's only when a disk is about 2 thirds full or more. Has anyone else experienced such issues with a MZ-NH1?