I has happened to me too
So the world was deprived of the Perls I was trying to throw...because when logging back in the post is gone
I have advised people who write long posts to copy the text so they can paste it back in this case - and of course they never remember it - I don't
To secure that these well thought of posts can be finished - I have installed Autosave which is supposed to auto-save those posts until finished.
I have not been able to test it yet but if you ever loose a post again - let me know (it should not happen anymore)!