Script causing an error after running for long time.

# Load WinSCP .NET assembly
Add-Type -Path "C:\Program Files (x86)\WinSCP\WinSCPnet.dll"

# Set up session options
$sessionOptions = New-Object WinSCP.SessionOptions -Property @{
    Protocol = [WinSCP.Protocol]::Sftp
    HostName = "sftp.MySite.com"
    UserName = "MyUserName"
    Password = "MyPWD"
    SshHostKeyFingerprint = "1234567890="
}

$session = New-Object WinSCP.Session

try
{
    # Connect
    $session.Open($sessionOptions)

    # Transfer files
    $sourcePath = "/Outbox/" # don't add *, will be added where necessary
    $destPath = "H:\FTP\"
    $destPathNew = "H:\FTP\Caspio\"

    $transferOptions = New-Object WinSCP.TransferOptions

    while($True)
    {
        try {
            # Get list of matching files in the directory
            $remoteFiles = $session.EnumerateRemoteFiles($sourcePath, "*.*", [WinSCP.EnumerationOptions]::None)

            # Any file matched?
            if ($remoteFiles.Count -gt 0) {
                foreach ($fileInfo in $remoteFiles) {
                    try {
                        Write-Host "Checking rules for the file " $fileInfo.Name
                        # check the filename for matching the mask
                        if ($fileInfo.Name -like "*PAT*.*" -or $fileInfo.Name -like "*Sch*.*" -or $fileInfo.Name -like "*Full*.*") {
                            # check if the file exists in the local download folder
                            if (![System.IO.File]::Exists($destPath + $fileInfo.Name)) {
                                # download the file
                                $transferResult = $session.GetFiles($sourcePath + $fileInfo.Name, $destPath, $False, $transferOptions)
                                $transferResult.Check()
                                
                                $destFile = $destPathNew + $fileInfo.Name   # local path where to copy files
                                $sourceFile = $destPath + $fileInfo.Name    # local path where was downloaded new files

                                if ( ![System.IO.File]::Exists($destFile)) {    # check if the file exists in the destination folder
                                    # copy the file in the destination folder
                                    Copy-Item -Path $sourceFile -Destination $destFile
                                    Write-Host "Copy of file $($fileInfo.Name) succeeded"
                                }
                            }
                        }
                    }
                    catch {
                        Write-Host "Exception catched on file $($fileInfo.Name)"
                        Write-Host $_.Exception.Message
                    }
                }
            }
            else {
                Write-Host "No files matching $wildcard found"
            }
        }
        catch {
            Write-Host "Exception catched while downloading new files"
            Write-Host $_.Exception.Message
        }
    }
    Write-Host "Waiting..."
    Start-Sleep -Seconds 5
}
finally
{
    $session.Dispose()
}

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