i have two limitless plus rdta
and while they can leak
its usually one of two things
the wicks are too thin and when you lay it on its side the juice runs past the wicks onto the deck and out of the AFC holes
or its o rings
the top oring that holds the cap wears down and lets juice run form the fill port out the AFC
FOR YOU it sounds like you need to disassmble and replace the orings holding the glass on
Whether it be an Ijoy Combo, Limitless RDTA Classic, Plus, or standard, they are all built the same so the previous replies definitely cover what you need to look for.