Space Invaders and Homerun Battle 3D each have a "music" menu. If I play my music from within HB3D, or if I turn off the music option in Space Invaders, the problem doesn't occur. But this is a huge PITA to have to do it every time I play a game. Now, I just completely shut down my iPod at the end of the day to temporarily fix the problem. I'm sure that developers would point their fingers at Apple, and Apple would point right back.