During a idle test, there are no keep alive messages sent after upgrading the client to 2.2.6. This is causing idle connections to be dropped and query requests to fail.
Jun 02, 2016 2:35:47 PM com.couchbase.client.core.endpoint.AbstractGenericHandler onKeepAliveFired
FINE: [/10.4.2.129:8093][QueryEndpoint]: KeepAlive fired
But nothing is logged during an idle session after the upgrade to 2.2.6