No sound coming from the phone without reason

[WePhoton]

Different audio issues appeared at some point here (volume, headphone, microphone, …), as @robbert.f says also contact costumer support for diagnosis.

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

From what I’ve been informed, it can’t be self-diagnosed. Again, the best practice for when experiencing any audio issues is to contact our Customer Support. They are the ones that can provide a proper diagnostic and provide assistance.