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I faced with that error on r12.1.3 EBS system. My db version is 11.2&2 node RAC system.

My first node is goes down by below errors:

opiodr aborting process unknown ospid (11075852) as a result of ORA-28
LMON (ospid: 63767522) detects hung instances during IMR reconfiguration
LMON (ospid: 63767522) tries to kill the instance 2. 
Please check instance 2’s alert log and LMON trace file for more details.
Tue Mar 19 10:58:36 2020
USER (ospid: 32900426): terminating the instance due to error 481
Tue Mar 19 10:58:36 2020
Errors in file /oracle11g/PROD00/db/diag/rdbms/PROD00/PROD001/trace/PROD001_lmon_63767522.trc:
ORA-29702: error occurred in Cluster Group Service operation
System state dump is made for local instance
System State dumped to trace file /oracle11g/PROD00/db/diag/rdbms/PROD00/PROD001/trace/PROD001_diag_9373174.trc
Instance terminated by USER, pid = 32900426

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