A new update is available for Base SAS , version 9.4_M1 :
SAS® 9.4 Metadata Server cluster might become unresponsive after a user bulkload program is completed
A SAS® 9.4 metadata user bulk load can take many hours to complete when the SAS® Metadata Server is clustered
Note: A comprehensive list of all SAS hot fixes is available from support.sas.com. You can use the SAS Hot Fix Analysis, Download, and Deployment (SASHFADD) tool to manage your SAS hot fixes.