Random Logout Issues in Grafana with Dex OAuth on Kubernetes

Hi All,
Any one know how to fix?
logger=authn.service t=2025-08-28T16:02:09.969529829Z level=warn msg="Failed to authenticate request" client=auth.client.session error="user token not found"

Even “admin” logs out randomly with above error

hello

What version of grafana?
What kind of install (on prem, cloud, docker, k8)?
Are you using some custom auth?

Hi
grafana version: v12.0.2
Install kind: K8s
custom auth: yes
auth.generic_oauth:
name: Dex
enabled: true
client_id: xxxx
client_secret: xxxxxx
scopes: openid email profile groups offline_access
auth_url: <https://dex.xyz/auth>
token_url: <https://dex.xyz/token>
api_url: <https://dex.abc/userinfo>
redirect_uri: <https://grafana.xyz/login/generic_oauth>
role_attribute_path: "contains(groups, 'k8s-platform:k8s-members') && 'GrafanaAdmin' || 'Editor'"
allow_assign_grafana_admin: true
use_refresh_token: true

I created a new issue https://github.com/grafana/grafana/issues/110152