Powershell and robocopy pausing

I am using powershell and Robycopy to move files from volume to another.  Server 2008R2 iSCSI volumes on

It seems that powershell window occasionally pauses.  When I hit enter the process just starts up again.  It is taking more that a day to move 2TB of data.  Command is: robocopy h:\ j:\ /e /mov /R:5 /W:10 /log:c:\movedidson.log /TEE /NP /ETA

Also an empty folder remains on the first drive.  Why is it not deleting the folders after it copies.

Thanks,

Mark