7th Dragon 2020

[LunaMoo]

You listed three things which could lead to problems:
- downloading pirated iso,
- using english patch(see problems mentioned earlier in this thread),
- possibly playing using just savestates.

All of those could lead to crashes which original game doesn't have.

The only one you can easily fix from those is the last one, just save the game normally in save point, restart emulation and reload from that normal save. Savestates simulate playing games without break for a very long time and many commercial games become unstable and buggy after like 8+ hours of non stop play, some even earlier that counts original hardware as well.
For the other two problems - buy the original game and avoid patching it(and also forget about savestates, they can't be used between patched/unpatched games).