Do you have the "remember me" box checked when you log on?

If the "not logged in" message appears, you can save your effort by looging in from that very screen... because the board buffers your submission while you verify you're a member (but not if you leave that page.)

When you say you've been tossed totally out... can you give more detail? That sounds like a problem with your own network or your internet access or the ISP server.

Lastly, an easier work around is, before posting, just highlight everything and ctl-C copy it. Then, if tossed out, you can open notepad and paste it there(or hold it in the clipboard) until you get back to the site...