Error burning mp3s

Hello from New Zealand. I have converted AAC files in itunes to Mp3 format and have then made a playlist of mp3 files. However when I try to burn the playlist to a blank CD I have problems. It starts the burning process ok but after about 10 tracks an error note appears and the burning process stops. This of course means the cd can’t be used. I have wasted 3 cds and want to know if anyone can help. By the way I also tried burning AAC files and that worked fine.