You have liquid flowing into the center hole and gotta get it to stop, or it just continues to flow thru capillary action. Try taking the clearo off, and blow hard into the drip tip. If there's juice in the center hole you'll hear it gurgling and it should come out the bottom. If you don't always keep the ecig upright, you're much more likely to get juice in there. I get a drop on the battery occasionally w/ my CE4's, but when it happens I rest it for a while after blowing it out, and they always stop leaking. The annoying thing like I was saying tho, if you don't take measures to get it to stop, it will continue leaking. You can also get liquid in the center hole if you hit it too hard/long, cuz you'll literally suck juice right into the center hole like a straw. And another thing that can cause it is if the center post on the battery has gone too low, from overtightening a clearo or charger. If that happens you gotta pull the post up a bit w/ a tiny screwdriver or something similar.