Marc,
Thank you for reporting the issue. We are working to identify a fix and will post when it is resolved.
While we work to resolve this is it possible to switch your device to use the REST API?
Take a look at this example on how to use the REST API to do bulk updates. It has the added benefit that you may be able to send your device to sleep between sending data to the server, potentially extending the battery life for battery powered devices.
-Vinod