I think this is just a glitch in the system. I've had it happen to me frequently in the past, and it happened to me just the other day. Had a couple thread tabs open, went to reply to one thread, clicked to post, and I was logged out. Had to log back in. It's annoying, but I don't think there's anything much that can be done...? :idontknow:
Is your browser up to date? You could try deleting your cookies, sometimes these can mess things up. Or if you have any browser plugins installed you could try disabling them.
You could also try an alternate browser. I have FF and Chrome both installed on my pc because I sometimes find a particular website (not this one though) will not work properly with one or other.
How to do it depends which browser you are using. Ask google how to do it for your particular browser.How would I find that out (my browser is up to date and disabling browser plugins)?
How to do it depends which browser you are using. Ask google how to do it for your particular browser.
Which browsers are you using? It might be a technical issue, or a bug. I doubt you've been hacked, as i did a google and found others with same or similar issue.
Any extensions installed? Are cookies allowed to be set? Local storage of data allowed?
You could try using Firefox browser.