Vault 403 Intermittent Issue

I am getting 403 error in some pods of my kubernetes cluster, this issue is intemittent that’s why I can tell all my configs are correct.

Vault - [Vault 1.5.4]
Kubernetes - v1.23.16-eks-48e63af
Vault agent - hashicorp/vault:1.12.1
this vault is setup is external vault and not the cluster itself. We have agent configured here.