Problem with Connect-VIServer and Disconnect-VIServer on my powershell script - windows

Question

I've a problem with my powershell script and I don't know how to fix it.
My script allow to recover the VM protected by Zerto and to get each tags of these VMs on the vcenter.
My problem is on how my script works.
At the beginning, I initiate a connexion on each Vcenter because the VMs are located on two differents Vcenter. Then I can recover the information that I want for each VM.
#### Skip SSL/TSL verification
add-type #"
using System.Net;
using System.Security.Cryptography.X509Certificates;
public class TrustAllCertsPolicy : ICertificatePolicy {
public bool CheckValidationResult(
ServicePoint srvPoint, X509Certificate certificate,
WebRequest request, int certificateProblem) {
return true;
}
}
"#
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy
#### Set connexion to each Vcenters
#### Connect to XXX
Connect-VIServer -Server Vcenter1 -User My_User#my.domain -Password XXXX
#### Connect to XXX
Connect-VIServer -Server Vcenter2 -User My_User#my.domain -Password XXXX
[...]
#### Create post-script file with VM + Vcenter + Tags + Cluster
foreach ($VPG in $Get_VPG){
$VM_List = $BaseURL+"vms?vpgName=$VPG"
$VM1 = Invoke-RestMethod -Uri $VM_List -TimeoutSec 100 -Headers $zertSessionHeader_json -ContentType $TypeJSON | ConvertTo-Json
$VM2 = $VM1 | ConvertFrom-Json
$VM3 = $VM2.value.VmName
foreach($VM in $VM3){
$Get_Tag = Get-VM $VM | Get-TagAssignment
$Get_Tag_And_VM = Get-VM -Name $VM | Select-object Name,
#{N = 'vCenter'; E = {([system.uri]$_.ExtensionData.Client.ServiceUrl).Host}},
#{N = 'Tags'; E = {(Get-TagAssignment -Entity $_).Tag -join ', '}},
#{N = 'Cluster';E={Get-Cluster -VM $_}}
$Get_Tag_And_VM2 = $Get_Tag_And_VM | Where-Object {$_ -match 'Tags=;'}
Add-Content $Result -Value $Get_Tag_And_VM2
}
}
Write-Output "[+] Deconnexion Vcenter1 et Vcenter2"
Disconnect-VIServer -Server Vcenter1 -Confirm:$false
Disconnect-VIServer -Server Vcenter2 -Confirm:$false
I can see that at the beginning of the script, each connexions are done :
And I can see that I can recover each informations that I need from a CSV file.
At the end, I have a two disconnect. But at this step, I've this error :
You can see that in the script, the disconnect part is Disconnect-VIServer * -Confirm:$false.
I have the same problem with Disconnect-VIServer * -Confirm:$false and with a disconnect for each Vcenter.
Are able to tell me why I've this error whereas each connexion are done well at the beginning ? And I don't know why this problem doesn't appears everytime. The problem appears occasionally.
Does anyone have an idea about this issue ?
Thanks a lot !