I have that problem to. It appears that if you are "inactive" for a short period of time (reading long posts; walk away for a short break; or similar), then when you go to post, the site doesn't believe you are still logged in although it usually indicates you are - it just won't act like it. I have now made it a habit to copy my post. That way if it thinks I am not logged in, the I can log in again and paste my post without having to retype it. I don't know how some of these members post these really long, long post without it happening to them.
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