Don't know if this has been mentioned before but I have found lately that laying my Buzz down on it's side between uses rather than standing it on end or sticking it in a holder (vase, jar, stand, etc.) has helped to avoid leaks into the unit. Topping off right before setting it down gives the
juice time to soak into the carto avoiding
juice in the mouth. And the carto seems to vape a lot more smoothly. Maybe because the
juice is being distributed evenly along the length of the carto as opposed it being top heavy (topped off) or bottom heavy (nearly dry). If the button is up when I pick it up, I turn it button down to vape off it to make sure the juice is dispersed on all sides. Haven't been at it long enough to tell for sure, but the cartos seem to be lasting longer as well.