com.snaplogic.cc.snap.common.SnapStreamException: Error communicating with Feed master

after upgrading to 4.18 GA, a large number of pipelines are failing with error as below :::

com.snaplogic.cc.snap.common.SnapStreamException: Error communicating with Feed master: https://hc4t03835:8084

it was not happening before the upgrade but failing a lot now.