Psx problems/shadowman/starwars t p m



I got copys/backups of the above 2 but when i back them up everythings fine.
But when i play them they seem to just freeze at random it hell t play them but i try
is it the games or lousy b/ups
i use cdrwin 3.7c phillips scz 3600 x2
i have no grief with other games
is it the orig or just lousy copys i got any help appreciated thanks in advance