This is most likely a database or connectivity issue and I would suggest you review the following docs.
Troubleshooting Guide ORA-609 : Opiodr aborting process unknown ospid (Doc ID 1121357.1)
Alert.log shows ORA-609 with TNS-12537: TNS:connection closed (Doc ID 1538717.1)
11g: ORA-609 TNS-12537 and TNS-12547 or TNS-12170 in 11g Alert.log (Doc ID 1116960.1)
Whether this issue is reported on Prod environment for the first time?
Have you implemented PCP on your EBS?
If So, whether are you executing the Concurrent Manager startup scrpt from both the nodes, If so, it is not required, It is enough to start from the Primary node alone.
Agree with Hussein. It is DB listener problem, might be because of network glitch and now CM processes/workers are in unknown state which generally fixed by cmclean.sql
Concurrent Processing - CMCLEAN.SQL - Non Destructive Script to Clean Concurrent Manager Tables [ID 134007.1]
1. stop CM service
2. Run cmclean.sql
3. restart CM service
Kindly the Cmclean.sql script has been retired recently
and has been replaced by
Concurrent Processing - CP Analyzer for E-Business Suite (Doc ID 1411723.1)
Concurrent Processing - Concurrent Manager Recovery Troubleshooting Wizard (Doc ID 134007.1)
it is very useful for troubleshooting the concurrent managers issue