ironically, the exact same thing happened to me.
Normally, what I do is highlight all the text then do a right click copy to save it away just in case,
but my mouse went psycho on me and the web page went back in history rather than
copying the text, which means the text was lost.
I feel for you. Nothing is more frustrating to me than losing a response.
(Maybe the universe is trying to tell us something.... I'm just too dense to understand it)
--- bill