You may encounter this error message:
Neo4j.Driver.SessionExpiredException: Server at neo4j://neo4j-core-123abc-7.production-orch-xxxx.neo4j.io:7687/ is no longer available due to error
When an initial driver connection is established, the driver receives the topology of the Neo4j cluster. This topology is used with the pool of connections. This can result in stale connections if the topology of the cluster changes. Examples of why this might happen is a cluster update or the replacement of a failed cluster member.
The driver automatically retrieves a new routing table with an updated cluster topology. At that point, you shouldn't see any more occurrences of Neo4j.Driver.SessionExpiredException error.
See this article for information on how to avoid this error.