Hmm, well I've seen it happen a few more times, and it always seems to happen when I move to a different floor (which in Izuna, makes the game save). So I dunno if that's a factor but, who knows.Actually it's pretty normal (to me and a few at least) that the emulator alone crashes a lot and randomly.
I solved it using the no$gba 2.6a (donators only) + no$zoomer 188.8.131.52 (searching this forum only).
Also, be aware that if you do not close the emulator properly, you lose your save file till the last part you closed the emu. You can write on your save file without closing your emulator by going File > Save Battery. With no$zoomer the default shortcut is Shift + C, but you can change it.