ARM Template - Custom Script Extension Error

I face the following error while deploying my VMs to Az.

At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/DeployOperations for usage details.  
Details:  
VMExtensionProvisioningError: VM has reported a failure when processing extension 'CustomScriptExtension'. Error message: "Command execution finished, but failed because it returned a non-zero exit code of: '1'. Command execution may have been interrupted by a VM restart"  
More information on troubleshooting is available at https://aka.ms/VMExtensionCSEWindowsTroubleshoot   
Check out the troubleshooting guide to see if your issue is addressed: https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/deploy/azure-resource-group-deployment?view=azure-devops#troubleshooting  
Task failed while creating or updating the template deployment.  

Below is the portion of Custom Script Extension being used:

"condition": "[equals(parameters('templateType'),'domainJoinAndPuppet')]",  
      "apiVersion": "2015-06-15",  
      "type": "Microsoft.Compute/virtualMachines/extensions",  
      "name": "[concat(variables('vmName'),'/CustomScriptExtension')]",  
      "location": "[parameters('location')]",  
      "dependsOn": [  
        "[concat('Microsoft.Compute/virtualMachines/', variables('vmName'))]"  
      ],  
      "properties": {  
        "publisher": "Microsoft.Compute",  
        "type": "CustomScriptExtension",  
        "typeHandlerVersion": "1.10",  
        "autoUpgradeMinorVersion": true,  
        "settings": {  
          "fileUris": [ "URL of PS Script 1",   
           "URL of PS Script2"  
          ]  
        },  
        "protectedSettings": {  
          "commandToExecute": "[variables('agentCommandToExecute')]"  
        }  
      }  
    },  

This script sometimes work and sometimes doesn't work at all.