What is/was the "minor issue about the audio feature of the phone" "in less than 1% of the phones"?

Maybe I’m encountering that issue, both speakers of the phone just stop working randomly. Sometimes in the middle of a facebook video, when I put i on widescreen or when I unplugged headphones, after speakers doesn’t working until I restart or wait. Weird! I will open a ticket I think. Already posted on the forum: [Fairphone 3 both speakers doesn't working sometimes]