I've also noticed that the site boots me out after a while.
More than once I was actively on the site when I started writing something to post and when I hit the "Post" button, nothing happens......
I've learned that when this happens I need to highlight and copy everything I've written to my computers temporary memory.
Then, by hitting the refresh arrow on my web browser I am suddenly at the site but I'm not logged in.
By re-logging in I can get back to the topic I was writing in and finally post my thoughts.