Hello @L2Fly,
as you might be aware, the gemfire, as any other web app server, is a JVM (a Java Virtual Machine), which has some known memory boundaries, as Heap sizes and Garbage Collection loads. If you would analyze the service with SAS Environment Manager or a JMX Console, you could have some clues on what goes wrong.
I can think on several options: handled log too large (solution: change configuration to rollover smaller logs), GC is too high/reaching heapsize limit (solution: further analysis of logs to know more about it)... etc.
In the end and in short, the best way to understand your problem is to analyze your logs (increasing the info level to debug level if required) and the status of your memory. The causes could be many.
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