i had a problem with my mini leaking, i was getting all sorts of juice in my mouth, and i could not figure out the problem. i noticed that the tube in the middle was not completely straight, so when i screwed on the top cap it was not creating a sufficient seal. i had this problem with a vision v3 clearo and the problem with that was the plastic tube started coming off of the metal base, those dont screw on or off so i just shoved it back down, problem solved, but that was not the case with my vivi, those screw on to their metal bases. so after screwing and unscrewing and being certain i did it right, it was still not aligned. then i just happened to notice that the metal base had a gap from where the threaded connector was coming out of the ring that the plastic base screws into. it was not as easy as just squeezing it back to place, i had to actually take a pair of pliers and gently pop back in, after that things returned to normal, and i can once again love my vivi mini, and when i say love, i freaking mean it, i love this thing, hope that helps someone.