I experienced the same thing. It seemed to sometimes get gradually worse, sounding like wood crackling in a fireplace, until it finally crescendoed with a big pop. Then it would usually disappear. The crackling was part of the recording. No one could give me a definitive explanation of why it was happening but I eventually concluded that it was the cd rom used to extract the wav-files. I ended up buying a plextor cd burner - which are reviewed as being the best for burning in terms of audio quality and reliability. I use the burner to both extract the files to the harddrive and then to burn the cd. I also use verbatum cdr's. I haven't had a bad burn since.
