Ahsay OBS version 220.127.116.11
When trying to restore on-premise Exchange mailboxes, the restore stops after 3GB has been restored.
This is the first and only time we have seen this issue.
It first appears to be a Java error, but is an AhsayOBM error.
Ahsay wrote a hotfix for the OBM installation. Afterwards the restore completed.
Please contact us if you are also experiencing this issue.