Resolution: Based on customer feedback, the default JVM heap size for LiveCluster 3.1.1 is often too small. The 128MB heap size can cause Server instability including halted jobs and failing Servers.
If you are currently using LiveCluster 3.1.1, you should increase the JVM heap size to 384MB (for 512MB RAM servers) or, ideally, 512MB (for 768MB+ server). In addition, if task reporting is not required, turn off task reporting in the Server Configuration page.