There's a bug on sounds where playing sounds create DOM nodes without deleting them. This may cause unexpected behaviors after around 600-800 times you play the sound, and go mute after a sound has played exactly 1,000 times (1,000 DOM nodes).
This has been discussed on this topic, saying that this will create DOM nodes that are never deleted, and you may hear corrupted audio after you play a sound 600-800 times. And too many DOM nodes can crash Snap!
This is why you may hear strange audio.