I had this efa linker for a few months now, today, it just stopped saving, and my saves vanished after my friend dropped it. It doesn't seem like anything inside is missing/broken off. After some testing, it seems like the battery has been disconnected or died, as the save is here if I turn off and on my SP really quickly, but if I just turn it off and turn it on later, the save vanishes. And I can't seem to open it up. So, any solutions for this problem?