Well, Princo does suck haha. You shouldn't use cheap media like that with your PS2 anyway, because if the laser isn't bad, it will wear it down faster and make it bad. I don't know what the problem is, but if it can be avoided by using good media that one should be using anyway, use the good media.
ALLERGY ALERT: The above post may be nuts.
N64, GBA, both un-modded.
NTSC U/C PS2 v4 w/No Solder v4 (SOLD, DRE... Laser Died
NTSC U/C PS with Plugmod (SOLD to pay for above