Symfony3 how to make Remember me work?

Question

symfony

Friends, colleagues welcome!
There is a project on Symfony 3.1.4. There are users, there is a standard authorization and verification form.
In app/config/config.yml

session:
  handler_id:  session.handler.native_file
  save_path: ~
  cookie_lifetime: 2678400 # месяц
  gc_probability: 0
  cookie_path: /

In app/config/security.yml

security:
  encoders:
    AppBundle\Entity\User:
      id: app.custom_password_encoder
    AppBundle\Entity\Project: bcrypt

  role_hierarchy:
    ROLE_ADMIN: [ROLE_USER]

  providers:
    our_users:
      entity: { class: AppBundle\Entity\User, property: email }
    accounts:
      entity: { class: AppBundle\Entity\Project, property: email }

  firewalls:
    api:
      host: ^api
      anonymous: true
      stateless: true
      guard:
        authenticators:
          - 'jwt_token_authenticator'
          - 'project_authenticator'
        entry_point: jwt_token_authenticator

  main:
      pattern: /.*
      anonymous: ~
      guard:
        authenticators:
          - app.security.login_form_authenticator

      form_login:
        login_path: security_login
        always_use_default_target_path: true
        default_target_path: /
        provider: our_users
        remember_me: true

      logout:
        path: /logout

      remember_me:
        secret: '%secret%'
        always_remember_me: true
        lifetime: 2678400
        remember_me_parameter: _remember_me
        path: /
        domain: ~

  access_control:
     . . .

When authorizing, a cookie is set, expiration for a month in advance, everything seems to be fine. But if you update after a while (I honestly don’t know how long), the site asks you to log in again. Cookie disappears.
Why is this happening, please help. Thanks in advance!