In the .410 update I started getting a Loading Error for "audio/bgm/El%20Infausto%20Ladr%C3%B3n%20de%20Joyas%20A.ogg" when I entered the abandoned desert village with the pyramid and it has gone away since.
It's a well known glitch. I'm guessing while they were beta testing something, they accidentally changed the audio (was used as an ogg) to rpgmov without adjusting the code to reference it.
To fix it until the next patch, you can go into the files as follows:
www > Audio > bgm
Now find El Infausto Ladron de Joyas. There should be two files: A and B.
Go ahead and clone these two (just in case of corruption).
Change the file type from .rpgmvo to .ogg by renaming it. While renaming, make sure the file names are the exact same as the original files.