Thanks for pointing it out man, I fuckin knew there was something wrong with mp3’s 
This is exactly what happened:
- started with wav, worked fine on my normal test file (~30s)
- thought “I need more words for accurate WER”
- found the files on wikipedia
- got error because I was trying to send ~200mb in one go.
- got lazy, didn’t want to implement consistent chunking.
- changed file type to mp3 to reduce size
I then proceeded to check the file’s by listening to them, and concluded that it sounded fine to my human ears 
Ngl, that’s the funniest idea I’ve heard all day, I just have zero experience with autotuning stuff, could you point me in the right direction?