Clojurians Log v2

It seems that instantiating the Cognitect AWS client for SQS works the first time, but subsequent instantiations and attempts to use the object (e.g., sending an SQS message) result in a ConnectionException (channel closes), which propagates as a CompletionException. This issue was resolved using defonce, but it appears to stem from a problem with interfaced endpoint services, where creating a new connection seems problematic. Has anyone else faced a similar issue? Just a code example:

(let [sqs-client (aws/client {:api :sqs})]
(:QueueUrl
   (aws/invoke sqs-client {:op       :GetQueueUrl
                           :request {:QueueName "hey-you"}})))

=> ""
(let [sqs-client (aws/client {:api :sqs})]
(:QueueUrl
   (aws/invoke sqs-client {:op       :GetQueueUrl
                           :request {:QueueName "hey-you"}})))

Bum! CompletionException