Glad to hear that the problem with your tank is fixed Andria.
If you look at how the tank works, you'll notice that part of the coil contacts the chimney, the tube in the center of the tank, and the contact area is flexible, rubber like. Since the coil turns into the base and the base turns into the tank, turning the base when you're removing it or putting it back on can cause the coil to turn in the base at the same time. So whenever you refill check the coil to make sure it's not loose in the base.
As you've already discovered finger tip tight is the best way. I learned that phrase from a vaping video, meaning not as tight as possible with your fingers but just firmly.
That must have been it, the turning just loosened it *ever* so slightly. I was worried it was something I had done; I used a pipe cleaner to wipe out the inside of the mouthpiece, but I did it while the tank was apart from the base, so I didn't think I could have damaged anything that way, but just didn't know. The e-juice that came out also worried me, that I had gotten it someplace it didn't belong; one of the first times I took it back apart, I also used a pipe cleaner to swab out that 'chimney', and gently wiped the post that extends into the chimney wit a paper towel, and there *was* a tiny amount of juice, and I have no clue how it got there, because I was very careful to fill it down the side of the plastic, rather than anywhere near the center. *shrug*
At least now I'm not so afraid of it; new gizmos make me afraid I'm going to break them; I really am clumsy! When we walk thru Hobby Lobby, it seems my husband wants to walk RIGHT thru the decorative ceramic ware, and I'm so paranoid, me and my big coat and big purse and big feet, I feel like a gorilla in a wedding cake factory!

Andria