I got my copy of Y today, at last. But there's a problem. The background music cuts out randomly. It happens a lot, during battles, while going through towns, ect. Effect sounds such as attacking still play, but the background music is gone until a time comes when the music is meant to change, such as normal battle music going into victory music. Additionally, sometimes incorrect music plays, such as the victory music in the overworld.

Is this happening to anyone else? I know it isn't an issue with my 3DS, because all other games are fine and all other sounds that aren't the background music still play. I just want to know if I have a fucked up copy that I should return, or if this is happening to other people. I don't want to lose my progress, but I also don't want a wonky cart that will have more serious issues later on. (And the music thing is pretty annoying)

TL;DR Is anyone else having trouble with the background music cutting out?