Kevin,
I think what you're describing is referred to as the notorious "buffer underrun" - which means the read material isn't being written as fast as its read, and usually happens when making a CD to CD copy.

Best solution, is to always copy the tracks to your hardrive first, and then burn from the hardrive to your burner.

Also, shut down anything else thats running in the background (chewing up resources, memory, etc.) If running Windows, the only 2 programs you should have running (before launching the burn program) are Explorer and Systray. Everything else should be closed.

The newer versions of Adaptec Easy CD Creator have buffer under-run protection" which is a little bit of added insurance - but best to copy the tracks to you hard drive first, and then burn them to the CD. Hope this helps.