3729951 - Recurring Errors "Unable to load data" or "Can't load metadata from the S/4HANA system" on Enter package data - SAP Group Reporting Data Collection

• When entering Package Data and selecting Value Help there are several errors like: "Unable to load data. Try again later, or check your SAP Cloud Connector and SAP S/4HANA configuration. " or "Can't load metadata from the S/4HANA system" when opening Define Data Mapping. 
• Some users receive: “Service /sap/opu/odata/sap/API_GRTRANSACTIONDATA_SRV/$metadata call was terminated because the corresponding service is not available.”
• Error HTTP 404 with reason “Not Found” for API_GRTRANSACTIONDATA_SRV $metadata.
• In some cases, related areas (for example, Manage Packages) show empty value fields and errors when selecting values.

SAP Group Reporting Data Collection (GRDC) connected to SAP S/4HANA Cloud, Private edition

api_grtransactiondata_srv, $metadata, http 404, method not found, service not available, enter package data, grdc cache, synchronize data, odata metadata, backend service activation, sicf, intermittent connectivity, Unable to load data. Try again later, or check your SAP Cloud Connector and SAP S/4HANA configuration. , KBA , FIN-CS-CDC-DC , Cloud Data Collection - Enter Group Reporting Data , Problem