I don't recall ever being 'timed-out' and my brain is so slow these days it usually takes me about three days to write anything. How long fo you have to wait before the time out kicks in?

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Before facebook nobody cared what you had for breakfast; they still don't.

I often get "timed out" if I try to post when I've been logged on for a while.

Just like the OP, I still show as logged in at the top of the page but when I hit the Send button a message appears saying I'm not.

Sometimes I can get my post back after relogging in, but sometimes I lose it completely (in more ways than one if I've just spent time writing something lengthy )!

If I remember I've been logged in for a while, I copy the post before sending. At least then I can just paste a second attempt.