2979628 - Error "HTTP ERROR 405 HTTP method POST is not supported by this URL" encounters intermittently in live data connection to BO universe with SAML SSO authentication in SAP Analytics Cloud (SAC)

Below error message happens intermittently in live data connection to BO universe with SAML SSO authentication:

HTTP ERROR 405 HTTP method POST is not supported by this URL
URI: /sap/boc/ina/saml/SSO
STATUS: 405
MESSAGE: HTTP method POST is not supported by this URL
SERVLET: org.eclipse.jetty.servlet.ServletHandler$Default404Servlet...

Sometime SSO error doesn't show but data source selection is greyed,
If clear browser cache or work in incognito mode, it works but some time does not work again.

Upgraded LDC from 3.0 to 3.x issue still exists.

• SAP Analytics Cloud (Enterprise) 2020.14.23
• Live Data Connector to Universe ver 3.0 / 3.1 / 3.2 / or 3.3

SAP Cloud for Planning, sc4p, c4p, cforp, cloudforplanning, Cloud for Analytics, Cloud4Analytics, CloudforAnalytics, Cloud 4 Planning, BOC, SAPBusinessObjectsCloud, BusinessObjectsCloud, BOBJcloud, BOCloud., SAC, SAP AC, Cloud-Analytics, CloudAnalytics, SAPCloudAnalytics,Error, Issue, System, Data, User, Unable, Access, Connection, Sac, Connector, Live, Acquisition, Up, Set, setup, Model, BW, Connect, Story, Tenant, Import, Failed, Using, Working, SAML, SSO, sapanalyticscloud, sap analytical cloud, sap analytical cloud, SAC, sap analyst cloud, connected, failure, stopped , KBA , LOD-ANA-LDC-UNV , SAC Live Data Connection Universe , Problem