Leaking Kayfun Lite/Russian 91% clone

[Sugarfoot]

Been using two of these exclusively since Spring. Now, after multiple builds, one, then the other has been leaking thru the airhole. Everything looks tight, but anything over two mls leaks out until there is one ml. left then vapes great. Any advice on troubleshooting?

 

[vapdivrr]

sounds like an oring issue but is very strange because whats the chances of both devises going bad at the same time. has your build and juice changed recently or has everything stayed the same ?