I'm using NERO 188.8.131.52. When I perform a CD to CD copy (on-the-fly fast copy) I experience fluctuations with the recorder buffer level. This only happens with a direct CD to CD copy, and I have no problems copying from the hard drive. After done burning, NERO usually gives a count for how many times buffer underrun was avoided. With my problem, the count is around 200. The actual burned copy works fine, but because the software is busy avoiding buffer underrun, it takes much longer to burn the CD. This problem is new, and I have not experienced this porblem before. After some troubleshooting, I DO NOT believe that it is a problem with RAM or any other system resources, especially since I have not made any changes to my machine. The only guess I have is that perhaps either the source drive, recorder drive, or both are getting old. I appreciate any help you can offer. Thanks!