Plextor Graphic Problem

[eldonideus]

A couple of questions for you all:
I have a PlexWriter 16/10/40A and am having problems burning a clean CD+G. On disks that I am copying, I end up with 3-4 offcolor squares per screen. About a third of these stay as the song progresses until the end has a lot of these on the screen. The lyrics are readable, for the most part, but they just don't look that good. Things seem a little better when I burn a song that I created through KPro but I haven't done that many and it may be a coincidence. I am using CDRs from MTU and burning at 1X. I also have made sure I have updated video and sounds drivers. There are no driver updates for my CD burner and I have DirectX9.0. I am looking to make one of the 'professional' type copies. Any ideas on what my problem might be?
I see that MTU offers a 'certified' CD burner but it looks to be a Plextor. Is there a quality difference between my model and the one offered by MTU?
Thanks in advance,