This is a particularly odd case, and I just can't come up with a solution. While playing Super Mario Galaxy 2, the background music will go completely silent after about five minutes. It doesn't matter where I am, on the "ship", or in any of the worlds, the music will vanish. This is weird because all other sounds in the game will continue to function perfectly. Still, it's a huge problem, because the music is such a big and wonderful part of Nintendo games. I've tried various different ISOs of the game and have tried tweaking different audio settings, but the music never ceases to just stop after about five or six minutes of gameplay. I'm completely stumped. Any suggestions?

PS: SMG2 is the only Wii game I've played on Dolphin. All my GameCube ISOs work 100% perfectly. So, I guess it could be a problem with all Wii games, rather than just SMG2.