Pretty much this. I know this is the confirmed post for such but I just wanted to add, I accidently left my 3Ds on last night for 5 hours and still no freeze. So I think it's good to go.
@Xdqwerty, Osu! Tatakae! Ouendan! is the Japanese version of the game, different settings/characters/songs but otherwise identical mechanics. I played that before I knew about Elite Beat Agents lol. Both fantastic games https://en.wikipedia.org/wiki/Osu!_Tatakae!_Ouendan