Cannot break do-while loop in Powershell - powershell

Question

I have been working on this PowerShell script. I'm still pretty new at this. The way it works is that I give it a list of servers which it goes though and restarts the App Pools 1 by 1. I have been having a problem with the snippet below. I do not use Restart-WebAppPool because it sometimes gives the App Pool a start before it's ready and leaves it stopped. I cannot show the whole script because it's big and has proprietary info. The problem that I'm having is I can't seem to break the do-while loop. In it I'm checking App Pool status to make sure that it's stopped.
What I get appears for $PL_Break appears to be a valid string showing "Stopped". However, even when it shows "Stopped" it doesn't break the loop.
$PL_Timeout = New-TimeSpan -Seconds 95
foreach ($PL_Server in $PL_ServerName)
{
$PL_Stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
Write-host "`n`n`nRestarting App Pool : $PL_AppPool"
write-host "Stopping: " $PL_Server -f Green
Invoke-Command -ComputerName $PL_Server -ArgumentList $PL_AppPool -ScriptBlock {param($PL_App) Stop-WebAppPool -Name $PL_App}
do {
sleep 5
$PL_Br = Invoke-Command -ComputerName $PL_Server -ArgumentList $PL_AppPool -ScriptBlock {param($PL_App) Get-IISAppPool $PL_App | Select-Object State}
$PL_Break = [string]$PL_Br.State.value
} while (($PL_Stopwatch.elapsed -lt $PL_Timeout) -or ($PL_Break -ne "Stopped"))
} # Foreach - Server