404 No such file or directory

We’re using zero-to-k8s helm to deploy jupyterhub + jupyterlab.
We’re mounting Azure file share to user’s pod by using k8s pv/pvc.
However occasionally we get 404 GET: No such file or directory error on some of the notebook files, but it doesn’t have actual impact to any file.

Does anyone have an idea what the issue might be?