Error: Failed to install provider / unsuccessful request, 503 Egress is over the account limit

Terraform
1

Every now and then terraform init fails with the error below. Can someone suggest why?

Error: Failed to install provider
 
Error while installing gavinbunney/kubectl v1.13.1: unsuccessful request to
https://github.com/gavinbunney/terraform-provider-kubectl/releases/download/v1.13.1/terraform-provider-kubectl_1.13.1_linux_amd64.zip:
503 Egress is over the account limit.

The provider is defined as

---
terraform {
  required_version = ">= 0.13"

  required_providers {
    kubectl = {
      source  = "gavinbunney/kubectl"
      version = ">= 1.7.0"
    }
  }
}