At 9:45 #3 hoist displayed encoder fault causing hoist to trip out.10:00pm MSHA notified. Co. contacted to troubleshoot issue.Hoist reset,test trips ran,hoist functioned properly,decision made to bring crews out via #3 hoist.All crews out of mine @ 11:48pm.MSHA notified apx.11:55pm. Fault caused by loose connection in the PLC rack.Connection secured, multiple test trips were ran.