This happened to me too on an Android phone. It turned out according to the web to be some logfile that keeps growing and which I don't know how to delete -- it

This happened to me too on an Android phone. It turned out according to the web to be some logfile that keeps growing and which I don't know how to delete -- it doesn't show up in the system-provided views of what's on there. (I'm sorry this is so vague, I'm not interested in Android and it's been quite a while since I gave up.) It's still running because I deleted all the apps except a few core ones, but I'd appreciate some tips about this too.