process

Hi everyone,
My database is 10.2.0.5.0 standard edition having 4GB RAM.
yesterday my alert log file showing these messages and my database hang for a moment.

Tue May 15 05:36:40  2012
Process q002 died, see its trace file
Tue May 15 05:37:33  2012
ksvcreate: Process(q002) creation failed
Tue May 15 05:52:38  2012
Process q003 died, see its trace file
Tue May 15 05:52:38  2012
ksvcreate: Process(q003) creation failed
Tue May 15 05:53:48  2012
WARNING: inbound connection timed out (ORA-3136)
Tue May 15 06:00:07  2012
Process J001 died, see its trace file
Tue May 15 06:00:07  2012
kkjcre1p: unable to spawn jobq slave process

my parameters is:

job_queue_processes       integer     10
processes                          integer     150
sessions                             integer     200.

plz help me

Best Regards