Vlccontrol.media make my program stuck after some time

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VB

Hello

I am writing a program in vb.net
In my program I need to do that videos in a certain folder will appear one after the other.
In order to do that i am using vlc version 1.1.1.1 with vlcControl object
, everything work fine but after some hours the program is stuck-it is not responding

The line where it is stuck is :

MoviOfSlidePicMovi1.Media = VlcMedia

In order to solve it I tried to release the memory via these Sentences:

 Public MoviOfSlidePicMovi1 As VlcControl
Public VlcMedia As Vlc.DotNet.Core.Medias.PathMedia
 If (MoviOfSlidePicMovi0.Media IsNot Nothing) Then
   MoviOfSlidePicMovi0.Media.Dispose()
  MoviOfSlidePicMovi0.Media = Nothing
 End If
  If (VlcMedia IsNot Nothing) Then
      VlcMedia.Dispose()
       VlcMedia = Nothing
 End If
  VlcMedia = New Vlc.DotNet.Core.Medias.PathMedia(str)
  MoviOfSlidePicMovi0.Media = VlcMedia

when it didn't worked, I tried the same sentences without the dispose sentence:

 Public MoviOfSlidePicMovi1 As VlcControl
Public VlcMedia As Vlc.DotNet.Core.Medias.PathMedia
 If (MoviOfSlidePicMovi0.Media IsNot Nothing) Then
  MoviOfSlidePicMovi0.Media = Nothing
 End If
  If (VlcMedia IsNot Nothing) Then
       VlcMedia = Nothing
 End If
  VlcMedia = New Vlc.DotNet.Core.Medias.PathMedia(str)
  MoviOfSlidePicMovi0.Media = VlcMedia

the program worked better ,but still after few hours it was stuck

NOTE:
I am using the same object to show all the videos-it mean I am using one vlc player ,I open one video and when I want to replace it I am changing just the media property

How can I make it work without causing the program to be stuck after some time ???

Please help me it very urgent to me

thanks a lot

What I have tried:

I tried to release the memory- in the way that I wrote in the body of the question
but it didn't solve my problem