Integrating Vault with Go/gorm Application

I have set up vault with my k8 cluster according to this sample demo-vault/dynamic-secrets-k8s at master · nicholasjackson/demo-vault · GitHub and everything works fine but at some point during the day my application(Go/Mysql) goes down with “Access denied for user” error.It leads me to conclude that the rotated credentials are not propagated to my application.What am i missing or what would you suggest as the best way to tackle this?