just received this reply from liteon after they asked me for the S/N of the recorder…
Dear Valued Customer,
Thanks for your feedback.
Kindly be informed that the firmware has been latest.
We suggest you try other brand discs to check whether the problems remains the
If still no help, it means the unit is defective,
please send it back to retailer/store where you purchased it for repair.
If you have any other question,please do not hesitate to tell us,
Customer Service Division, DCBU