Note this is intermittent issue that we were not able to reproduce but it happened couple of times in the past few months in the lower environment.
Steps to Reproduce:
Expected Results: The app server should remain available.
Actual Results: The server is not accessible.
Release : 16.0.1, 16.0.2
Component : Clarity Architecture
DE64874, fixed in 16.0.3 and 16.0.2.1
Workaround: Restart Services.