Well, i had this problem A LOT with internet explorer. The page cannot be displayed, and i end up writing my post all over again .
So, i got myself firefox, and instead of the page cannot be displayed appearing, and my post disappearing, a little pop up box appears saying the operation timed out, and my post, and whatever page below, stays exactly the same. Happy days!
Are you guys attaching large files to your posts or something? They should be nearly instantaneous, regardless of what type of connection you are using.