Plextor Burner Won't Record

[AwwShuxxx]

When we bought our MTU Suite 2 years ago, we also purchased the Plextor CDG Burner with it. Over time, the MTU Suite has had to be reinstalled several times, because MicroStudio Icon fails to open the program -- as does all components of the MicroStudio Suite. (Dunno why this happens, but I digress).
After one recent episode, when MTU failed to open as requested, I once again reinstalled the Microstudio Suite. Now, when I try to record CDGs, the Plextor burner, which has never before given me any problems, will refuse to finish the recording. Somewhere in the middle of the recording, I will hear the error message .wav, and then a little screen appears to inform me that a "Write Command Failed: Bad Medium Or Disc". Now, I know that there are bad discs out there, but never this many! And these same discs work perfectly well in my regular CD burner, for audio CDs.
Any thoughts?????
BB