Hello
You are not alone with this problem. From my research it is a design issue. The solutions are plentiful too many for me to type but this is where l found them.
-Youtube: If you type in "complications with the aspire triton" you will see a video by Vape Check. Read comments below for solutions.
-Internet: If you type in "Aspire triton 2 leaking". There are a number of forums discussing many solutions that have worked for them.
Good Luck.