Sometimes when I log in I get logged out after a couple of minutes and have to log in again.
Also today when I logged in and click on attached images it say's I'm not logged in in the new tab opened and when I tried logging in again it just brings me back to the login page.
Yep, I have to log in again to view the above attachment, even though I am already logged in and can reply to posts otherwise. And I have to log in again for every attachment, even the same one.