After a username and password were updated that are used to communicate between vRA and vSphere it was thought that something in vRA or in vIDM was caching the old user name and password and trying to authenticate frequently.
Environment
Aria Automation all supported versions
Cause
A scheduled vRO workflow is using the old username and password.
Resolution
Stop the scheduled vRO workflow
Fix the workflow so it no longer uses the old username and password