Need help with problem burning cd's with Mac G4

Ok, I'm new to burning cd's and I'm having problems with audible dropouts in cd's I'm burning. There are numerous short audible dropouts at random intervals in cd's assembled from a playlist. I have a new 12" G4 Mac Powerbook, stock 256 ram, with Superdrive. I'm importing the cd tracks to Itunes, then ripping with the internal drive onto Memorex cd-r media. This is a really new computer and it isn't loaded with data intensive files. Do I need more memory, configuration changes, external hard drive, external burner or what? Thanks, Will.