Variations of the address you're using to access the forum may result in your browser misplacing your cookies. For example:
http://clraik.com
http://www.clraik.com
https://clraik.com
https://www.clraik.com
May each be interpreted as different websites depending on how your browser handles the protocol prefix and subdomain. If you log in at https://www.clraik.com and end up at https://clraik.com, then your browser may lose track of your login.
Always use (you need an account to see links) when visiting the forum, and watch out for that address to change in any way when your account appears to have been logged off.