Neo 2.2 is known for overpowering the laser. The result is that after a while the drive stops properly reading CD-Rom discs. Even audio CDs start to fail. You can rise the laser power adjust, but that will help only for some months. And when it's completely exausted, the only rememdy is either buy a new unit or replace the laser. I sugest you to adjust the laser, then use it until it breaks. Then you buy a new PS2 and mod it with a decent modchip like Messiah 2.
This board has posts on how to adjust the laser. Good luck, man
SCPH-10000_GH-001 SCPH-15000_GH-003 SCPH-18000_GH-008 SCPH-30001_GH-005 SCPH-30000_GH-016(V4) SCPH-30001_GH-010(V4)
2xSCPH-10190, 2xSCPH-10350, 2xSCPH-10280
"**** j0 hackers!"
-Sjeep (As seen on TOXIC OS ELF...)