If a user disconnects from a share but files remain open on the file server, the files can be closed manually using Server Manager.
In the server manager go to All Servers, select the file server from the list, right-click and select Computer Management.
Navigate to Open Files by going to Shared Folders and then Open Files. This will show all files opened by users over the network.
To close files held open by a disconnected user select them from the list, right click and select Close Open File. Do this for all open files of the affected user.
NB. Before closing a file make sure all users have closed all multiuser jobs in Candy.