We usually see multiple entries for the same journal mailbox in the J3 queues on journal archiving servers and hence we need to clear the J3 queues and restart the journal tasks again. We run the following powershell commands remotely on each of our journal archiving servers atleast once a day to stop the tasks, clear MSMQ entries, clear the MAPI profiles (Outlook 2013) and start the tasks.
For mailbox archiving servers, if required, we clear the A5 queues as well incase there are any stale entries from the previous scheduled run.
Stop-Service "EnterpriseVaultTaskControllerService"
Get-MsmqQueue | where {$_.queuename -like "*private$* j3*"} | Clear-MsmqQueue # for journal archiving servers
Get-MsmqQueue | where {$_.queuename -like "*private$* a5*"} | Clear-MsmqQueue # for mailbox archiving servers
Get-ChildItem -Path "HKCU:\Software\Microsoft\Office\15.0\Outlook\Profiles" | Where-Object {$_.PSChildName -like "EV_*"} | Remove-Item -Force -Recurse
Start-Service "EnterpriseVaultTaskControllerService"