Fog Causing memory leak in packaged build

working on a game with spooky lighting and fog. only whenever we put fog in a level we get limited amount of time before we get a fatal error or memory leak error log. the only thing that seems to satiate the memory hogging packaged build is to remove local fog from any and all levels.

any insights into what is causing this leak so we can patch it locally so we can get on with development is greatly appreciated.