So, I loaned my 3DS to my girlfriend a few weeks ago so she could play Professor Layton Azran game.
She came to me a few days later and told me her save data was deleted, so I took it back and told her I'd take a look later. Turns out my save data is gone, too, as well as my downloaded copy of Donkey Kong Country Returns.
Has anyone had this issue before? Any ideas on what's up?