Created .BRTSMs are broken. Crackle/static sound

[TheIrishKokiri]

I've searched around but haven't been able to find a solution to my problem. I make tons of .Brstm's for brawl. While some come out fine, others will all of a sudden start with this really loud crackling/static noise, and then either switch to a different song, or just stop completely. I set the HZ or whatever it is when converting it to 32000 like someone suggested, but it didn't work. Replacing different songs, and even re-converting the song doesn't fix the problem.

I can't figure out what's wrong :/

[Segtendo]

In-Game?
You gotta defrag your SD card.

[Changeling]

This happened to me when I made a BRSTM that was longer than the original. Replaced the menu theme with a 7-minute one from another game (TrackMania Sunrise) and it did this about halfway through, changing to a crackly version of F-Zero X's Rainbow Road. Then it would eventually change back and sound totally normal...