I have 2 Cleitos (work in a vape shop and I get them super cheap
. I only use the 0.4 coil, as I had issues with the 0.2 spitting. I have recently been having issues with one of my tanks leaking through the air holes at the bottom. I always close the airflow when I screw the top cap back on after refilling, this occasionally helps, but sometimes does not. I have run 70/30 and 100%vg juice through them, neither seems to make a difference.
The oddest thing is that there is no pattern to the leaking. Occasionally it will happen when I've left my vape lying on its side (which is normal), but sometimes it will leak while sitting upright.
2 Guesses:
Poor seal on the o-rings at the base of the coils that I have been using.
Vapor condensation on the inside of the coil building up enough to begin dripping down to the base.
Both seem equally likely. Sorry I don't have a solution to offer.