So, I was playing FESS for the first time in a couple of months today, and I remembered that I had a file that I had been working on for quite a while. I had beaten the main storyline, about 3/4 of the units, including Tower and Ruins recruits, were highest 20. When I realized I still had this file, I was excited to finish it up and have the useless perfection of all promoted 20's. After playing for about an hour, I took the headphones out of the GBA I was using, and put in a new pair, because they worked better. Now somewhere in this process, I think I may have bumped the cartrige in a wrong way because once the new earbuds were in, the screen completley scrambled, and the music turned into fuzz. I turned it off fairly quickly, but when I restarted all of my files were gone. Needlessley to say, I was pissed beyond all hell. >_<
Now the only thing I can think of that may have caused this to happen besides bumping the cartridge was at the level I was on (tower level 5) I got Myrrh to Lv. 20, but I used the mine glitch and was having her use one of the fangs instead of the dragonstone. I was wondering if anyone had a clue why it happened.
That happened to me once. I shrugged and started over.
I had the same experience happen twice to me before, actually. I just turned the game off both times, let it sit for a few days, then all the data came back.