We have identified a bug in NTA 4.0 related to storage issues for the new Flow Storage Database.  In cases where NTA FSBD reaches 1TB of data stored, NTA will not process any new data and flow collection is stopped.  While we have seen a small percentage of customers with the affected versions installed, we would encourage customers to install the applicable hotfix.  Install this hotfix on your NTA Flow Storage Database, primary Orion poller, any additional Orion poller(s), and any additional Orion website(s) in this order.

Hotfix Link: