First I've heard of a saving issue in a long time, but I seem to remember there was an issue with EZ Flash in particular. I have one myself, so I'll try testing it on there soon.
Hello again! Everything is fine now, I tried to save a game via "sleeping" and every time I turned off my gba the saves were lost, so I started to use "Save state" of EZ flash. Thank you for the game, I loved it