*agree's with Dlanor*
If you got a 8x burner, get like a 16x disc, if you only have like a 1-2x burner, look around for either media that is like 1-2x or get a newer burner. ^_^
And I hear you, I got the same system with the same laser, you will see, if you reburn your game it will work. I'm about to try some +r's on it though since the minus R's are doing to me what it is doing to you, crapping out very fast. I'll let you know of the verbatims work better on a v15 when I get a chance to pick some up (kinda broke from my birthday).
IF it don't work on reburn (with several different types of media), google this part number: "PS2 TDP-182W", that's your replacement laser/carriage assembly, cheaper than buying a new ps2, and better than sending back to sony so you don't get the latest firmware which isn't fmcb compatible.
Somebody in here also said that they used a Q-Tip with a little bit of alcohol on the tip to clean the laser eye before and he's had the same laser a looong time, but he's had to adjust the pots aswell.
PSTWO Slim Silver v15 NTSC/US
PSP Slim Silver Daxter Edition 5.00-M33 custom firmware
Xbox1 60gb Hard drive all softmod with UnleashX
Xbox1 Stock HD Red/Black Case Softmod UnleashX
Fire Red GBA-SP