Every time I have received that error code, I hit my page refresh button. The screen clears entirely while it's re-loading but my work is always saved and restored. I have yet to loose a post and I think the system will save a post without you having to leave your computer running but don't quote me on this because I haven't tested my theory on this yet. I have been working on a post before over 24 to 48 hours and just left the window open with my computer turned on and I have never lost my work. I do think it is wise to back up text in a word document just in case. Especially, if it's a super long post.