Sytem account gets locked constantly

Hello:
I see that the System account gets locked automatically after a period of time. I login as SYS, unlock it and it is available for about 5 minutes before it gets locked again.
Can somebody tell me how I can prevent this from happening?
Thanks.
Venkat

I think it is not a bad idea to lock the system account.
However, to figure out, watch out the profile and limits of system.
Maybe OEM is trying to login with default password of system/manager and after 10 attemps, the account is lock (pure guess)
select username, profile, RESOURCE_NAME, limit
from dba_profiles natural join dba_users
where username='SYSTEM'
and resource_type = 'PASSWORD'
order by 1,3;
USERNAME PROFILE RESOURCE_NAME            LIMIT
SYSTEM   DEFAULT FAILED_LOGIN_ATTEMPTS    UNLIMITED
SYSTEM   DEFAULT PASSWORD_GRACE_TIME      UNLIMITED
SYSTEM   DEFAULT PASSWORD_LIFE_TIME       UNLIMITED
SYSTEM   DEFAULT PASSWORD_LOCK_TIME       UNLIMITED
SYSTEM   DEFAULT PASSWORD_REUSE_MAX       UNLIMITED
SYSTEM   DEFAULT PASSWORD_REUSE_TIME      UNLIMITED
SYSTEM   DEFAULT PASSWORD_VERIFY_FUNCTION NULLRegards
Laurent Schneider
OCM DBA

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