Won't read my DVD+RWs anymore!

[callisto_peter]

I have a V5 ps2 with a messiah 1 chip.
In the last 2 weeks my DVD+RW medias (fuji & verbatim)
acts really weird. I have LOTR: two towers on one of them and on the other SSX: Tricky and now they just don't work from one day to another. DVD movies is also an issue alot of stuttering and "unable to read disc" even though the disc isn't scratched or anything. My DVD+R games works fine though.

Is it my laser?

Do I have to clean it or something and how?

Anyway which DVD+R medias are the best for ps2 (is Verbatim or sony any good)?