This is a known issue reported in engineering ticket ACM-101553.
Not enough memory is available to the ActiveMQ queue during heavy processing of bulk Change Request items which causes messages to get stuck in the ActiveMQ queue intermittently impacting AFX processing and Change Request completion.
This issue is resolved in the following RSA Identity Governance & Lifecycle patches:
RSA Identity Governance & Lifecycle 7.1.1 P07
RSA Identity Governance & Lifecycle 7.2.0 P02
There are two workarounds needed:
Restart the stuck AFX requests, and
Manually modify the ActiveMQ memory configuration to prevent future occurrences of this issue.