Speakers sound distorted

Tonight when we listened to our Yoto Mini the speaker sounds quite distorted. It’s ok to listen to audio stories but the classical night radio sounds terrible. Nothings happened to it all day, it’s just been sitting on the table. Never wet/man handled, less than 1yr old. I have emailed Yoto but wondered if this has happened to anyone else before, and if so what was the outcome? Thanks in advance