Have you done anything that may have caused this?
1/ Have you installed/changed any hardware?
2/ Installed/changed/updated any system drivers?
3/ Installed any software?
4/ Changed your firmware?
5/ Changed media type or media batch?
If you haven't done any of the things listed above, then chances are, your drive just malfunctioned and you should RMA it.
If you want, you could try updating to the latest GS0H firmware found on the official LiteOn website, but if your problem just appeared "out of the blue" without you having done any of the things listed above, I doubt that it would change things, but it's worth a shot.