Hello,
Yes the system will log you out after like 10 or 15 minutes (or something like that) of not doing anything. Which includes typing your post. There are two things you can do to fix it. 1) When you log in there is a box that says 'remember me' right below where you log in. If you select that it wont log you out and you wont lose what you have typed. Unless you loose your internet connection. 2) Write what you want to post in a word document and then copy and paste it into the text box make sure you are still logged in and then put what you want to post in the box and then submit your response. These are the two ways to not lose what you write.