Spotfire nodes random start and stop


We just installed Spotfire 7.7 in production.   Using the admin port to look at Nodes and Services, the nodes/services appear to shut down on their own and then re-appear.  also it looks like they are constantly pinging the server or vice versa to ensure they are active; because the nodes blink every few seconds.   Is there a way to control how often they are pinging the app servers.

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