SQL changes execution plan

Hello.

DB is 12.2.0.1 SE

OS is RHEL 7

I have a SQL that changed execution plan to take a bad one 4 times during the last 2 weeks.

Everytime it takes a bad plan, I run this and it immediately takes the plan I want:

declare

pls number;

begin

pls := dbms_spm.load_plans_from_cursor_cache( sql_id => 'theSQLID, plan_hash_value => thePlanHashValue, fixed=> 'YES', enabled => 'YES');

dbms_output.put_line ('Resultat : ' || pls);

end;

/

But when I look into DBA_SQL_PLAN_BASELINES,  I can see that the column last execution is empty, which means the baseline is not used.

Parameter