Some folders cannot be accessed at first click

Hi,

We are having an issue with some network folders, when the users try to access some sub folders it not work, appear that message below. After the user try 2 or 3 times they can enter in the folder.

It's a Windows Server 2008 R2 file server and the client is a Windows Server 2008 R2 as well. Permissions are ok.

Alex Andrade Figueiredo