I recently bought a 3DS XL and tried to buy some downloadable content for Final Fantasy Theatrhythm. For some reason, this specific song, Final Fantasy 12 Boss Battle will not download, giving me the error 009-2920, which is a connection issue. The problem is, I can easily buy and download other songs on the service, as well as the router to which my XL is connected to is right beside me!
Edit: Strange, I just tried re-downloading the song after restarting and it worked.