has to restart minikube to make my service successfully resquested

Question

i do not understand why, sometimes, i have to restart minikube to make my stack OK.

My stack is the following :

• one Pod in a Deployment yaml file
• a Deployment yaml file for a 'dev' namespace
• a Deployment yaml file for a 'prod' namespace
• i use kustomization feature of k8s
• a service expose 'prod' Pod, another exposes 'dev' Pod

After ressources creation, i use in a browser, classically :

http://:NodePortOfProdService http://:NodePortOfDevService

Issue :

sometimes, i got message from my browser :

        ERR_CONNECTION_REFUSED

so i do :

minikube stop
minikube start

and then all is OK

What's going wrong ?