I have had this problm twice: while playing audio cds my plextor CDR stops, and I am unable to eject the cd. Further, and probably for this reason, the CD drive is not recognized by the system. Both times I have had to pull out the (what's it called, where you put the cd...) manually.
This is my system specs:
ASUS CUV 4X-D
Maxtor 40 GB
2 x Pentium 3 866/133
Hercules 3D Prophet II MX 86 MB (GeForce II)