All DT sensors, lose data if it cannot reach a Cloud Connector (CCON) within a few minutes.
If it reaches a Cloud connector that is offline, the data can be stored up to 10 minutes on the Cloud Connector.

That's why it's vital to troubleshoot devices as soon as they are found to be offline to minimize data loss. For troubleshooting guides see: DT sensors and DT Gen 1 Cloud Connectors.