I have repeatedly faced with fact that in new Hohner instruments not a complete seal. Since I periodically buy melody before important concerts or recordings, I got statistically over the past 2 years impression that melodica quality deteriorated – what I wrote in a letter to firm.
For comparison: in 1974 I bought in New York Hohner Piano 36 – then was the most professional tool. Until now, no repair needed, except for tuning one reed.
Maurizio, I advise You will also do it. We must not be silent!