Older PS2s have VERY *picky* lasers since they have the technology of those "older DVD drives" that are unable to read certain burned discs like those of DVD+Rs.
I'm trying to play Final Fantasy X DVD+R. I noticed there is a bug when I encountered sinspawn and then it's freezes. I went down to the shop and brought some DVD-R and Burned FFX game DVD-R. Ok, I'm playing FFX DVD-R and It's runs so smooth. I don't know why some burned DVD-R games run so smooth and some other burned DVD+R games can run really well. Is it cd/dvd writer have a different ways to burn a dvd or is it just PS2 a bit pricky laser??? or maybe is it just weird?
You have to also use good quality media, to avoid wearing out your laser. I had totaled a SCPH-39001 PS2 because of that.
Try Verbatim DataLifePlus (With super AZO) DVD-Rs, or some DVD-Rs that are known to have high quality.
Using low quality media/DVD+Rs may damage your laser.
Of course, if you're using a console with a newer laser like HD7, then this thing about DVD+Rs is pretty irrelevant.
Slimlines will probably accept all kind of DVD+/-Rs, but you should still use high quality media to prolong the lifespan of your laser.
Yes, it could have also been your writer, since some DVD writers don't do a good job burning DVDs (And you need to burn your discs at a lower speed to keep it reliable).
SCPH-10000 S. MINOKAMO v1.01 (Defunct)
SCPH-10000 S. KISARAZU v1.00 (faulty)
SCPH-15000 S. KOHDA (With warranty seal!) :D
DESR-5100 S. EMCS