So I have had my mini nova for a couple weeks now used it for the first week, and then bought a regular vivi nova and have been using it until today when I switched back to the mini. When I pull on it, slow or medium draw it creates a whistling sound. It is still drawing well and producing good vapor but is kind of annoying. Any idea what may be causing this? It is only on the mini and it is a long wick version.
