Hi @Abby Greentree apologies for the delayed update on this. I have feedback on this from the team.
Generally, it is recommended to restart the agent any time the connection information is altered, or certificates get rotated.
A new version of Device Update Agent 1.0.1 is also released yesterday. Starting from version 1.0.1, the DU Agent will automatically re-authenticate when the SAS token has expired or invalid. Here is the link to the updates on the new version IoT Hub Device Update Agent 1.0.1 I appreciate it if you can test the Device update with the latest release and let us know if you run into any issues.
Hope this answers your question. Please let us know if you need further clarification on this.
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