We have DD in our infra with OST plug ins installed on media server , however as per my observation media servers randomly stops processing DD related jobs until we restart nbrmms service.
NBU Version 220.127.116.11 on Windows 2008 r2 enterprise.
Solved! Go to Solution.
refer to this article if it could help.
Also consider NetBackup version upgrade.
If it won't help I recommend to log a support call for this type of problem.