PS2 laser dying?

[Pereb27]

Hello.
So, I bought an used PS2 a while ago, it's a v13, and I'm attempting to use Breaker Pro on it. However, I'm getting issues with it.
The PS2 has trouble recognizing the disc. On my first attempt to use it i got the RSOD. Afterwards, it worked a few times, then I kept getting the RSOD again.
I found out that when I boot th PS2, the disc will start to spin for a few seconds, then will spin slower for again a few seconds, then it stops spinning and I get RSOD. However, if I hold down the motor for 2 seconds when it starts spinning slower, and release it, it will start spinning at normal speed again and load just fine. I don't get what could the problem be... Any ideas?
I have tried cleaning the lens and the disc already. All my other discs (tried PS1 original, PS1 backup, PS2 original and PS2 backup) work fine.
Thanks in advance.

EDIT : Apparently it is actually a v12. I disassembled it to check the motherboard, it is a GH-035. I thought it was a v13 because it has the EE+GS chip (I stripped the top cover off once to check that, but never stripped the motherboard completely). So yeah I'm clueless.

[angloma]

try other dvd , I used dvd-r and the game lagged , then i switched to dvd +r , worked great

[Pereb27]

try other dvd , I used dvd-r and the game lagged , then i switched to dvd +r , worked great

I'm talking about PS1 backups here. All my discs (PS1/PS2 originals and backups) work fine except that one disc. I don't know if it's because of scratches because my PS3 recognizes it as a PS1 disc perfectly.