It is a tut for you.
Personally, before I knew how to do it, I sometimes lost my post content, and I have to retype it when facing with session time-out.
1. Always click on Preview button in order to have a back up of your post in draft page. You can see more in my topic -
Draft page - Pros & Cons2. If you don't do this (Preview button), there is another tut for you to get your post content back. Click on the backward button on your browser to get post content and use Refresh.
3. How to release contents when session time-out appears?
Copy your contents
Click on backward button to go back to previous page (the topic you want to release your post inside it).
Click on Reply button again
Paste the content (that you copied earlier) and click on Preview (just in case you need to use drafts later) and Post it.