I'm having an issue with my Mini Vivi. I always fill with a needle tip and am always careful not to over-fill so I'm not sure what is causing my issue. After several hits, sometimes I'll get a gurgle and then very little exhaled vapor. When I remove the tip, the top metal cap is full of juice. I end up having to clean the top metal cap along with the tip. It's getting rather irritating seeing as how I'm losing quite a bit of juice this way. And I'm tired of carrying around q-tips everywhere. Anyone have any suggestions?