Grafana Password getting expired every 15 days

I have installed Grafana using Helm chart. I could see the password gets expired every 10 to 15 days. Is there any way to stop this.

I have to do a password rest using script and all the data is getting cleared out.

I am using Grafana 8.4.5 in Azure Kubernetes. My Grafana is running as a POD. I use promethes as datascource.