DATABASE:AWSDLJIRLL004Z.JNJ.COM        : STATUS: A43:The Data Guard status of A43S is Error ORA-16825: multiple errors or warnings, including fast-start failove
Hello @Devalla, Naveena [JANBE NON-J&J], 
 
Upon checking the case with AWS vendor about unexpected boot, we could the issue occurred due to underlying hardware issues on the physical hosts where your instances were running. 
 
For more in detail, I have attached email for your reference. 
 
How automatic rebooted implement ?  
Because the instances were configured with automatic recovery enabled, AWS EC2's auto-recovery mechanism detected the failed System Status Checks and initiated an automatic recovery process, which included rebooting the instances on healthy hardware. 
 
 
 
 
  
Thanks & Regards,  
Shaik Javidh. H 
Linux | Unix Global Run Support  
