Oracle Database Discussions

SunOS 5.8
Database version: 9.2.0.4.0

Customer shutdown database every night for backup the datafiles to disk.
For your information, 2 weeks ago customer moved datafiles to a new disk.
The stoppscript has worked for a week.
And after a week the database will not shutdown.
We did a shutdown abort, and it works for a couple of days.
Now it happend again. The database will not go down.

Can't find any error messages!

Any suggestions?

#
# stoppscript
#
. $HOME/.profile
INSTANSER="BALA"
echo
echo "###########################################"
echo "# Startar nedtagning av O R A C L E #"
echo "###########################################"
echo
echo
echo "####### Stoppar LISTENER #######"
echo
$ORACLE_HOME/bin/lsnrctl << EOF
stop LISTENER
exit
EOF
for i in $INSTANSER
do
ORACLE_SID=$i
export ORACLE_SID
echo
echo "##### Stoppar instans - $ORACLE_SID #####"
echo
$ORACLE_HOME/bin/sqlplus /nolog << EOF
connect / as sysdba
shutdown immediate
startup exclusive restrict
shutdown
exit
EOF
done
echo
echo "########################################"
echo "# Slut nedtagning av O R A C L E #"
echo "########################################"
echo

#
# Alert_log
#
Tue Sep 5 01:16:48 2006
Shutting down instance: further logons disabled
Shutting down instance (immediate)
License high water mark = 41
Waiting for dispatcher 'D000' to shutdown
All dispatchers and shared servers shutdown
Tue Sep 5 01:16:55 2006
ALTER DATABASE CLOSE NORMAL
Tue Sep 5 01:16:55 2006
SMON: disabling tx recovery
SMON: disabling cache recovery
Tue Sep 5 01:16:56 2006
Shutting down archive processes
Archiving is disabled
Tue Sep 5 01:16:56 2006
ARCH shutting down
ARC0: Archival stopped
Tue Sep 5 01:16:56 2006
ARCH shutting down
ARC1: Archival stopped
Tue Sep 5 01:16:56 2006
Thread 1 closed at log sequence 11287
Successful close of redo thread 1.
Tue Sep 5 01:16:56 2006
Completed: ALTER DATABASE CLOSE NORMAL
Tue Sep 5 01:16:56 2006
ALTER DATABASE DISMOUNT
Completed: ALTER DATABASE DISMOUNT
ARCH: Archiving is disabled
Shutting down archive processes
Archiving is disabled
Archive process shutdown avoided: 0 active
Tue Sep 5 08:15:15 2006
Shutting down instance (abort)