Signed out too soon.

Has anyone else had this problem? I was in the middle of a long response to a thread, when the postman knocked at the door. I opened the door took in a parcel, then returned to my key board. I then spent some time adjusting my response. and then  pressed submit. But of course as you have already guessed it did not submit it, my work flew off into the ethos. ARRRRG. Is it me??