I get it all the time peak or not peak :-)
Ladies what helps is if you copy your text you have written before posting, paste it into simple program like Notepad (or an email program you can email it to yourself) and then you still have what you wrote. Also I found that if I hit the Back button on my browser once the error page is up I go back to the text I wrote. So you can recover what you wrote and paste it somewhere else while you wait for the server to recover.
Little tip someone dear to me taught me ;-)