I've started getting an intermittent stuffy note on the top A on my yani alto. It happens more after I've been playing a while. I don't think it's me. :shocked: The octave key seems to be opening properly. Does anyone know if this is a common problem or not. It's a while (6 years) since it's had a service, it's not easy to find a good tech out here in the sticks in france.