This happens to me all the time. What I do now is every time I finish writing a post I simply highlight it, right click anywhere on the highlighted portion, a menu will drop down and then I left click on "copy". Now it is saved to your cursor and you can hit submit(aka post message). If your post has timed out you just log back in, hit reply again, move your cursor into the box, right click again to get the menu and left click on "paste" and everything you highlighted before will come back up. Then you just hit submit. I do this on every website I use because they all always time out on me.

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