Background Job stuck after Copy-Item

i've a very strange issue with Background Job in Powershell.

I writed 2 powershell script, the first Module.ps1 contains my function, it's very basic, It creates New Psdrive, then copy a empty file toto.txt to my server, then it executes Get-Host on my server :

Function Test-One {
[cmdletBinding(SupportsShouldProcess=$True)]
Param(
 [Parameter(Mandatory=$true)]
 [ValidateNotNullOrEmpty()]
        [string]$ip,
 [Parameter(Mandatory=$true)]
 [ValidateNotNullOrEmpty()]
        [string]$username,
 [Parameter(Mandatory=$true)]
 [ValidateNotNullOrEmpty()]
        [string]$pwd
        )

Set-ExecutionPolicy Unrestricted -force
Start-Service Winrm

$shareadress = "\\$ip\c$\ISO"
$password = ConvertTo-SecureString -AsPlainText -Force -String $pwd
$credentials = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $username,$password

$session = New-PSSession -ComputerName $ip -Credential $credentials -Authentication Credssp -EA Stop 

Invoke-Command -Session $session -ScriptBlock { New-Item C:\ISO -itemtype directory | Out-Null}

New-PSDrive XEN -PSProvider filesystem -Root $shareadress -Credential $credentials -Scope global

Copy-Item -path "C:\toto.txt" -Destination 'XEN:\toto.txt' -Verbose

Write-Host "Copy finished"
Invoke-Command -Session $session -ScriptBlock {Get-Host}
$session | Remove-PSSession

}

When i use itdirectly in my shell, it works :

Test-one -ip "172.22.0.100" -username "Springfield\Administrator" -pwd "MyPassword"

Name           Used (GB)     Free (GB) Provider      Root
----           ---------     --------- --------      ----
XEN                                    FileSystem    \\172.22.0.100\c$\ISO

Copy finished

PSComputerName   : 172.22.0.100
RunspaceId       : 61ff6be7-e8ff-44e6-9b39-7433ce7c64c7
Name             : ServerRemoteHost
Version          : 1.0.0.0
......

I have a second powershell file named Job.ps1 who call the same function in a job :

Start-Job -Scriptblock {
Import-module C:\springfield\Citrix\Module.ps1 
Test-One -ip "172.22.0.100" -username "Springfield\Administrator" -pwd "Activlan2015"
}

Get-Job | Wait-Job
Get-Job | Receive-Job

Remove-Job -State Completed


Id     Name            PSJobTypeName   State         HasMoreData     Location             Command                  
--     ----            -------------   -----         -----------     --------             -------                  
17     Job17           BackgroundJob   Running       True            localhost 

When i call it, the job never stops, it completely stuck in running status.

The file is copied on the server, but it's stuck, if i remove Copy-item and New-psdrive in my function, the job works perfectly and Receive-job display the result of Get-host

Can somebody help me? i Don't understand why.

I use powershell 4.0

Thanks for your help