Has anyone else experienced a posting not being stored once they've submitted it? Happened to me again today, after I'd composed a few paragraphs reply via the reply to qotes method to someone's posting

This has happened a couple of times before, and in each case I'm sure it's when someone has made a new posting on the thread between the time I've clicked on the reply with quotes option, written my reply but before I clicked the submit button. I've got a feeling that in these cases the other member's posting started of a new page in the thread, but it could be me being paranoid
I'm going to have to either :-
1) get in the habit of composing such replies in a word document and then just cutting and pasting
or
2) using the save draft button before hitting submit