Longtext messages not correctly upgraded can cause the Sigma server to stop.
Remote Alarm Manager
Server shuts down
Upgrading of the Longtext messages was not carried out correctly.
All new Longtext messages were added correctly, but messages that existed before the upgrade were copied in and not upgraded.
The result of this was that the Sigma server would periodically stop.
When upgrading Sigma from a release earlier than 4.05, ensure that the Longtext folder is present in the Data folder, then run the Sigma upgrade programme.