maybe needs a lens clean, or the Zool disk has dodgy burn crease in it's actually disc, could be the cause of the corruption, and not a piracy question, but if you have the Original, maybe do a CD to CD copy of the disc, but make sure you burn at the lowest speeds, to ensure a deep burn..a standard CD ISO copy should do the trick.

hope this helps

A good suggestion, but it happens at different parts of playing although it could be a dodgy disc still I guess. Maybe as it's changing tracks. I'll have to see if it does it with other discs too.
Thanks Greyfox

Yeah sounds like a scratched disc

You could always take it to Game or HMV and have it buffed up, they charge about £1 I think. I am going to get a load of my Saturn games done.

Just use Brasso or Mer.

Have rescued many PS2 and wii games like that.

Well the CD32 works fine on Zool2 and others I have tried, so it must be a disc issue. Thanks for the replies you retro gaming gods