You could try removing the network drives individually rather than using "*" - perhaps "*" is dropping IPC connections as well?

Here is an example of how to remove drive mappings using the recently posted EnumNetworkDrives() udf:
Code:
For Each $sDriveMap In EnumNetworkDrives()
	If Not @ERROR
		$sDriveLetter=Split($sDriveMap,",")[0]
		"Removing network mapping '"+$sDriveLetter+"'..."+@CRLF
		Use $sDriveLetter /delete /persistent
		If @ERROR "Got error ["+@ERROR+"] "+@SERROR+@CRLF EndIf
	EndIf
Next
 
Function EnumNetworkDrives()
  Dim $WshNetwork, $oDrives, $i, $DriveArray[0]
  $EnumNetworkDrives=""
  $WshNetwork = CreateObject("WScript.Network")
  If Not @ERROR
    $oDrives = $WshNetwork.EnumNetworkDrives
    For $i = 0 To $oDrives.Count - 1 Step 2
      $DriveArray[Ubound($DriveArray)]=$oDrives.Item($i)+','+$oDrives.Item($i+1)
      ReDIM Preserve $DriveArray[UBound($DriveArray)+1]
    Next
    If UBound($DriveArray) > 0
      ReDIM Preserve $DriveArray[UBound($DriveArray)-1]
    Else
      $DriveArray = 0
    EndIf
  Else
    $EnumNetworkDrives=@ERROR
    Exit $EnumNetworkDrives
  EndIf
  $EnumNetworkDrives=$DriveArray
EndFunction