the two project where this occur where updated from 4.8 version
i cant tell you steps i do before this occur, i just do many things, i open blueprint, i delete and add some content, i launch game preview in editor, etcc and while i am working the editor become slower&slower memory usage go up to 1gb and more
both project are for android, maybe i will figure out something i do in particular that proc this memory leak
i will try to work on this project keeping an eye on memory and if i found something i will tell you