After 2-3 days of use, my cartos seem to lose the ability to hold more than 3 drops of juice. Any more and it starts leaking. And without adding drops, there's no vapor or taste. The filler still looks white and clean. Does that mean that the carto is done? Is there any way to revive/refresh/recycle it? 2-3 days seems a bit short-lived. The particular carto is a regular Boge. The juice is 50/50 pg/vg.