Kafka: Source-Connector to Topic mapping is Flakey

Question

I have the following Kafka connector configuration (below). I have created the "member" topic already (30 partitions). The problem is that I will install the connector and it will work; i.e.

curl -d "@mobiledb-member.json" -H "Content-Type: application/json" -X PUT https://TTGSSQA0VRHAP81.ttgtpmg.net:8085/connectors/mobiledb-member-connector/config      

curl -s https://TTGSSQA0VRHAP81.ttgtpmg.net:8085/connectors/member-connector/topics

returns:

{"member-connector":{"topics":[member]}}

the status call returns no errors:

curl -s https://TTGSSQA0VRHAP81.ttgtpmg.net:8085/connectors/mobiledb-member-connector/status


{"name":"member-connector","connector":{"state":"RUNNING","worker_id":"ttgssqa0vrhap81.***.net:8085"},"tasks":[{"id":0,"state":"RUNNING","worker_id":"ttgssqa0vrhap81.***.net:8085"}],"type":"source"}

... but at other times, I will install a similar connector config and it will return no topics.

{"member-connector":{"topics":[]}}

Yet the status shows no errors and the Connector logs show no clues as to why this "connector to topic" mapping isn't working. Why aren't the logs helping out?

Connector configuration.

{
    "connector.class":"io.confluent.connect.jdbc.JdbcSourceConnector",
    "transforms.createKey.type":"org.apache.kafka.connect.transforms.ValueToKey",
    "connection.url":"jdbc:sqlserver:****;",
    "connection.user":"***",
    "connection.password":"***",
    "transforms":"createKey",
    "table.poll.interval.ms":"120000",
    "key.converter.schemas.enable":"false",
    "value.converter.schemas.enable":"false",
    "poll.interval.ms":"5000",
    "value.converter":"org.apache.kafka.connect.json.JsonConverter",
    "key.converter":"org.apache.kafka.connect.json.JsonConverter",

    "name":"member-connector",
    "tasks.max":"4",
    "query":"SELECT * FROM member_kafka_test",
    "table.types":"TABLE",
    "topic.prefix":"member",
    "mode":"timestamp+incrementing",
    "transforms.createKey.fields":"member_id",
    "incrementing.column.name": "member_id",
    "timestamp.column.name" : "update_datetime"
}