Caused by: org.hibernate.exception.GenericJDBCException: Cannot open connection

We are using query entity to retrieve data from MySql database. It is working well, But sometimes we are getting Alert "ERROR:An error occurred while evaluating expression:" The node (in which we are using that expression) is getting crashed if we restart the node, it is working. Checked log files and found below log.
a!queryEntity: An error occurred while retrieving the data. (APNX-1-4198-000)
Caused by: com.appiancorp.suiteapi.common.exceptions.AppianRuntimeException: com.appiancorp.suiteapi.common.exceptions.AppianException: An error occurred while retrieving the data. (APNX-1-4261-002)
.....
Caused by: org.hibernate.exception.GenericJDBCException: Cannot open connection
          at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140)
          at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128)

This is an intermittent error, Has anyone faced this issue before? unable to find ...

OriginalPostID-138449

OriginalPostID-138449

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