I can see in the logs there is a SQL exception. However just before this is this statement:
12-Oct-2018 18:50:46.292 INFORMATION [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
Which indicates that Jira received a shutdown command. So I wouldn't focus on the SQL error, but instead, let's try to focus on why Jira got a shutdown command. Typically the shutdown command is coming from someone stopping the service, or running the stop-jira .bat/.sh file. From just the logs I can see so far, I can't tell for sure if this is the case or not.
It could be that some other process/service on the server is stopping the service, but when this happens on a Linux instance, we typically don't see the shutdown command in Jira's logs. Instead the system logs can track this as described in How to Resolve JIRA Process being Terminated Unexpectedly in Linux.
If that doesn't help, then I'd be interested to take a deeper look at your Jira logs to see if we can find any more clues about this shutdown.
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