Auth logout automatically when I reload with 3-5 times continuously

I worked with CakePHP 2. I am facing 2 of issues related to session and auth.

in a single controller, I have many functions I set a session in a function name is x when I am trying to use that session in function b I need to start the session again for the access any session value and this problem occurs randomly.

another I have a sestion and when I refresh it 2-3 time system logoit me