DFS Lock handle

My db getted very much EVENT "DFS Lock handle" . And so I Kill the problem session.

My db sequence's ddl.

CREATE SEQUENCE CSSADM.SQ_PI_CSSI_EVNT_LOG_1 

INCREMENT BY 1 START WITH 2309607073

MAXVALUE 999999999999999

MINVALUE 1 NOCYCLE CACHE 2000 ORDER ;

 

GRANT SELECT ON CSSADM.SQ_PI_CSSI_EVNT_LOG_1 TO RL_CSS_ALL;

GRANT SELECT ON CSSADM.SQ_PI_CSSI_EVNT_LOG_1 TO RL_CSS_SEL;

GRANT SELECT ON CSSADM.SQ_PI_CSSI_EVNT_LOG_1 TO RL_CSS_MPS;

GRANT SELECT ON CSSADM.SQ_PI_CSSI_EVNT_LOG_1 TO RL_CM_ALL;

GRANT SELECT ON CSSADM.SQ_PI_CSSI_EVNT_LOG_1 TO RL_AUTH_ALL;