We have identified the issue as incorrectly entered DB data on certain Binary Documents. For many documents, a patient would be related to the doc. The documents being retrieved by your requests are related to patients that have incorrect DB information. We are in the process of resolving this data and will update at our earliest opportunity. As for your timeout issue(s), the retrieval of documents using the Binary resource may take longer than our timeout of 40 seconds. In these cases, the easiest solution is to retry the request as Michele pointed out.
Thank you for your patience,