Thanks for your responses and I am pleased I am not alone in this.
I often forget to copy the post, I do mean to especially the longer ones but this not posting slips my mind and it pisses me off, I have never had this happen on other media just this site and it makes me wonder why? Why does this occur?
When it happened today I hadn't long been logged in, so the timing out has nothing to do with it.
These forums definitely need an overhaul. Back in the day this type of thing never happened that I can recall.