@tomyomy I don't remember doing anything in particular, but I can explain what I remember from my playthrough and it might help you recreate the issue:
After talking to the quest giver (orb), I got the spell that took form as a thick blue whiteish line. I found the water arrow spell and went to the right. I battled a few enemies and died in the hallway connecting the spawn point and the right room.
After I died, I repeated the process but killed the enemies and entered the room at the end of the hallway. I remember it having a staircase leading upwards. It was just as I reached the center of that room the sound faded out for a 1-2 sec, went quiet and suddenly started playing again.
At the time I thought it was intentional since the fadeout in itself didn't seem like a bug, but if it wasn't, you could always try and walk through the same process I did and see if you manage to encounter the same bug!