found dead dispatcher 'D000', pid = (26, 76)

Hi Guys,
My dear customer is getting a missave of the following messages :

found dead dispatcher 'D000', pid = (33, 26)
* nothing related in sqlnet.log and listener.log.
* also nothing related in system.log file
* also i do not think this is due to leak of resources

SQL> show parameter dispatcher

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
dispatchers                          string      (PROTO   =TCP) (SERVICE=dbsuiX
                                                 DB)
max_dispatchers                      integer

and shared_servers   integer     0

he is not using XDB also, any advise regarding this problem ?