USM shows intermittently all groups having all devices

Document ID : KB000115166
Last Modified Date : 01/02/2019
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An intermittent error in USM where all dynamic groups show all devices.
When issue is seen there are strange devices in USM that are called (null)
User-added image
UIM 8.51
Using the "list_deployments" callback in the trellis Probe Utility showed that the data_access_services service was deployed in trellis.

This is unsupported in v8.51 as the design has changed and these functions have moved to other probes
Removing the data_access_services service from trellis resolved the issue