LG CED-8120B buffer underrun

Hi, I was able to burn about 8 - 10 mp3 songs to cd format onto a cdr at about 8X. Recently I could only do 1 song at a time at 4X. Now I can't even burn any without the buffer underrun error. Even at only 2X, I can only get about 80% before the underrun. I've already upgrade the firmware to 2.0. Can anyone help? I have an old 166MMX with 32M RAM and free harddrive space of about 1G. Thanks.