I was just writing a post when my screen switched to "Lithium ... site is undergoing maintenance..." message (or the like)
I dispaired that I'd lost my carefully crafted (wisdom infused) post and closed the browser tab to try again later.
Later came and I went back to the post to which I was replying, hit reply and was met with a message offering to restore my auto-saved message. I didn't know the system was auto-saving.
Cool! and Thanks!