We are getting "bartender become unresponsive" and "remote procedure call failure" error messages in Commander log. From then,The print jobs are continuosly failing until we restart the commander service in the application server.  

Errors receiving : "Bartender process <ID > is unresponsive. The process will be restarted"

                            "Bartender process <ID >  has terminated unexpectedly. The process will be restarted"

                            "Commander encountered an error while connected to Bartender.The Operating                                       system reported an error 'The remote procedure call failed'"

Bartender version : 10.1 SR4

Build : 2961

Edition Enterprise automation

server OS version : Windows Server 2012 R2