This happens sometimes spontaneously AFAIK.
But right now, every time I click on the “redirecting arrow” it logs me out.
The redirecting arrow is that which makes a previous post visible, that someone is answering to in a later post.
For instance, when I try to see what igem is answering to. You can even see the “you were logged out” screen popping xD
Maybe it’s temporary though but if anyone can look into it.