I'm having some issues with some of my Main Menu songs. For all but one of the custom songs I put on the menu, after about a minute and a half or so, it will suddenly cut off and start playing the custom music I put on Pirate Ship. Has anyone else had this problem or know what's going on?
It is possible that your music is too high quality. Brawl BRSTMs use a sample rate of 32000 Hz. If your music uses a sample rate higher than 32000 Hz, it might behave erratically in-game.
It's either due to what he said or you are running low on space on your SD. Try defragging your SD.