As of yesterday, whenever wireless communication is enabled, after 10 seconds my 3DS will stop whatever it was doing and pull up the black screen stating:
"An error has occurred. Hold down the POWER Button to turn off the power, then turn it on and try again. For help, visit...
@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