On my 3rd iAtty I just got I was getting my first leak problem and I believe I found the fix, take a flat head screw driver once the iAtty is fully assembled screw the bottom conector counter clockwise; you should feel it get a little tighter and for me it stopes the leak completely.
On a side note a way to tell if that is your problem have the iAtty assembled and filled with juice. Hold it up it shouldn't drip now hold it on top of a napkin and you will see that's what causes the leak; once it's screwed on it's giving the pressure to cause it to flow out.
Also don't over tighten the iAtty on to the mod as that will cause that bottom conector to unscrew it's self. The pressure causes it to turn clockwise (gets loose) creating the leak.
On a side note a way to tell if that is your problem have the iAtty assembled and filled with juice. Hold it up it shouldn't drip now hold it on top of a napkin and you will see that's what causes the leak; once it's screwed on it's giving the pressure to cause it to flow out.
Also don't over tighten the iAtty on to the mod as that will cause that bottom conector to unscrew it's self. The pressure causes it to turn clockwise (gets loose) creating the leak.