loging out of site if navigatinhg to other pages in ruby on rails app

I have an issue when i am loging in to site after clicking on other menu tabs it is automatically loging out and if i wait for few minutes refresh and then login tabs are working fine.If i logout and login again and i click on other tabs geting loged out. I am not understanding where i need to check the code.

class SessionsController < Devise::SessionsController

POST /resource/sign_in

def create

respond_to do |format|

  format.json do

    self.resource = warden.authenticate!(auth_options)

    sign_in(resource_name, resource)

    return render :json => resource

  end

  format.html do

    super

  end

end

end

end