yeah either cleaning or...

Some models of playstation get a "disk read error" after the disk has loaded for a while! (The earlier PS2s) Mine does that with some games..but I hoovered it and it seems to work ok at the moment.....just take a few mins to load up each game...

try hoovering the front and back vent.....it worked for me...for some games...

haha sorry I couldn't be more help!!