I don't understand and I never had is why dose game offen crash and frize on the Amiga.
I don't really think it happens all that often, in comparison to some other systems I've played. Mostly, if a game crashes, it's usually because you were trying to play it on a system other than it was intended.
I know some games is real hard to play with out this happening like Moonstone for exampel.
Yes, Moonstone is very picky. PAL A500 or bust. I don't think I've seen it crash but once or twice on a real 512k chipram/512k baseboard A500, but it barely works (or doesn't even work!) on anything else. Often it is either because of old copy protection, or a bad crack. It's hard to tell which is worse, most of the time. Though, in Moonstone's case, I think it was also shipped before it was fully debugged.