Caf keeps telling me I'm not logged in!

Doing it to me too. I'm coming back to the site after a few days off it(work computer and all that), and I'm logged off completely, despite selecting to stay logged in. Happened twice on my home pc too.
 
Happened to me yesterday around 3 or 4 times, before disappearing. Donno if it helps.
 
Just happened to me right now. Said there was a security error and I looked up and I was logged out.
 
Happened (and is still happening) when I view the Premier League thread in the football forum. It's like the 10th time today. I don't re-log in though, if I click on the main forum thing, it will show me as logged in.
 
This usually happens in iPad. If you do not choose "keep me logged in", it asks for login everytime you click to naviagre threads/forums. Log in, then click General Forum and you have to log in again. And even if you choose "Keep me logged in", it usually logs out after few days.