I have this weird bug happening in wo3se and I think wo2097 too, where sometimes after playing a few tracks the colours on the screen start to go darker but in 'steps'. It makes it very difficult to see in tunnels. I suspected a problem on my Peritel cable, so I moved it around with no effect ,and strangely when I reset the game or go to the game menu the effect goes away.

So I'm wondering if this is a PS1 / wo3 bug ? My PS1 is model SCPH-9002.