Powershell - windows hard-disk health status is giving inconsistent results

Question

I am using the below PowerShell script to fetch hard-disk health status of windows machine: Get-PhysicalDisk | Select HealthStatus

Issue: For few of the machines the hard-disk health status is frequently changing from warning to healthy and vice-versa.

I wanted to understand why the same PowerShell script is giving varied results. If anyone has any idea on this would be much appreciated!