DB was down for unknow reason?

Dear all,
Last night the database was down for some unknow reason. I have checked the alert.log and see everything is ok (highlight in bold) and just around 15 mins the database encounter errors.
---------------------- alert.log --------------------------
completed checkpoint up to RBA [0x61482.2.10], SCN: 0x0018.5c593a50
Mon Jul 12 21:32:09 2010
Beginning log switch checkpoint up to RBA [0x61483.2.10], SCN: 0x0018.5c5a8410
Thread 1 advanced to log sequence 398467
Current log# 2 seq# 398467 mem# 0: /u01/oracle/proddata/log02a.dbf
Mon Jul 12 21:32:09 2010
ARC1: Evaluating archive log 1 thread 1 sequence 398466
ARC1: Beginning to archive log 1 thread 1 sequence 398466
Creating archive destination LOG_ARCHIVE_DEST_1: '/u02/oracle/prod/proddb/9.2.0/dbs/arch1_398466.dbf'
ARC1: Completed archiving log 1 thread 1 sequence 398466
Mon Jul 12 21:52:42 2010_
Completed checkpoint up to RBA [0x61483.2.10], SCN: 0x0018.5c5a8410
Mon Jul 12 22:06:33 2010_
Errors in file /u02/oracle/prod/proddb/9.2.0/admin/PROD/bdump/prod_dbw0_381128.trc:
ORA-07445: exception encountered: core dump [] [] [] [] [] []
Mon Jul 12 22:07:38 2010
Errors in file /u02/oracle/prod/proddb/9.2.0/admin/PROD/bdump/prod_pmon_426200.trc:
ORA-00471: DBWR process terminated with error
Mon Jul 12 22:07:38 2010
PMON: terminating instance due to error 471
Mon Jul 12 22:07:40 2010
Errors in file /u02/oracle/prod/proddb/9.2.0/admin/PROD/bdump/prod_lgwr_270448.trc:
ORA-00471: DBWR process terminated with error
Mon Jul 12 22:07:43 2010
Errors in file /u02/oracle/prod/proddb/9.2.0/admin/PROD/bdump/prod_ckpt_217272.trc:
ORA-00471: DBWR process terminated with error
Mon Jul 12 22:10:57 2010
Instance terminated by PMON, pid = 426200
Mon Jul 12 23:06:10 2010
Starting ORACLE instance (normal)
Disable cache advisory with old cache parameters
LICENSE_MAX_SESSION = 0
LICENSE_SESSIONS_WARNING = 0
SCN scheme 3
Using log_archive_dest parameter default value
LICENSE_MAX_USERS = 0
SYS auditing is disabled
------------------- prod_pmon_426200.trc --------------------
Dump file /u02/oracle/prod/proddb/9.2.0/admin/PROD/bdump/prod_pmon_426200.trc
Oracle9i Enterprise Edition Release 9.2.0.3.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.3.0 - Production
ORACLE_HOME = /u02/oracle/prod/proddb/9.2.0
System name:     AIX
Node name:     rsgsdb
Release:     2
Version:     5
Machine:     0051D32A4C00
Instance name: PROD
Redo thread mounted by this instance: 1
Oracle process number: 2
Unix process pid: 426200, image: oracle@rsgsdb (PMON)
*** 2010-07-12 22:07:37.939
*** SESSION ID:(1.1) 2010-07-12 22:07:35.646
error 471 detected in background process
ORA-00471: DBWR process terminated with error
--------------------- prod_lgwr_270448.trc ----------------------------------
Dump file /u02/oracle/prod/proddb/9.2.0/admin/PROD/bdump/prod_lgwr_270448.trc
Oracle9i Enterprise Edition Release 9.2.0.3.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.3.0 - Production
ORACLE_HOME = /u02/oracle/prod/proddb/9.2.0
System name:     AIX
Node name:     rsgsdb
Release:     2
Version:     5
Machine:     0051D32A4C00
Instance name: PROD
Redo thread mounted by this instance: 1
Oracle process number: 4
Unix process pid: 270448, image: oracle@rsgsdb (LGWR)
*** 2010-07-12 22:07:40.289
*** SESSION ID:(3.1) 2010-07-12 22:07:38.311
error 471 detected in background process
ORA-00471: DBWR process terminated with error
We are using database 9.2.0.3.
Please let me know if you have any ideas.
Thanks a lot.

here we go:
I don't find this file /u02/oracle/prod/proddb/9.2.0/admin/PROD/bdump/prod_dbw0_381128.trc
------- prod_pmon_426200.trc----------
Dump file /u02/oracle/prod/proddb/9.2.0/admin/PROD/bdump/prod_pmon_426200.trc
Oracle9i Enterprise Edition Release 9.2.0.3.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.3.0 - Production
ORACLE_HOME = /u02/oracle/prod/proddb/9.2.0
System name:     AIX
Node name:     rsgsdb
Release:     2
Version:     5
Machine:     0051D32A4C00
Instance name: PROD
Redo thread mounted by this instance: 1
Oracle process number: 2
Unix process pid: 426200, image: oracle@rsgsdb (PMON)
*** 2010-07-12 22:07:37.939
*** SESSION ID:(1.1) 2010-07-12 22:07:35.646
error 471 detected in background process
ORA-00471: DBWR process terminated with error
--------------------- prod_lgwr_270448.trc ----------------------
Dump file /u02/oracle/prod/proddb/9.2.0/admin/PROD/bdump/prod_lgwr_270448.trc
Oracle9i Enterprise Edition Release 9.2.0.3.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.3.0 - Production
ORACLE_HOME = /u02/oracle/prod/proddb/9.2.0
System name:     AIX
Node name:     rsgsdb
Release:     2
Version:     5
Machine:     0051D32A4C00
Instance name: PROD
Redo thread mounted by this instance: 1
Oracle process number: 4
Unix process pid: 270448, image: oracle@rsgsdb (LGWR)
*** 2010-07-12 22:07:40.289
*** SESSION ID:(3.1) 2010-07-12 22:07:38.311
error 471 detected in background process
ORA-00471: DBWR process terminated with error
------------------------------------- prod_ckpt_217272.trc --------------------------------
Dump file /u02/oracle/prod/proddb/9.2.0/admin/PROD/bdump/prod_ckpt_217272.trc
Oracle9i Enterprise Edition Release 9.2.0.3.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.3.0 - Production
ORACLE_HOME = /u02/oracle/prod/proddb/9.2.0
System name:     AIX
Node name:     rsgsdb
Release:     2
Version:     5
Machine:     0051D32A4C00
Instance name: PROD
Redo thread mounted by this instance: 1
Oracle process number: 5
Unix process pid: 217272, image: oracle@rsgsdb (CKPT)
*** 2010-07-12 22:07:42.781
*** SESSION ID:(4.1) 2010-07-12 22:07:40.295
error 471 detected in background process
ORA-00471: DBWR process terminated with error
Many thanks.

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    com.apple.driver.AppleBacklight          170.3.5
    com.apple.driver.AppleUpstreamUserClient          3.5.13
    com.apple.driver.AppleHWAccess          1
    com.apple.iokit.IOBluetoothUSBDFU          4.2.0f6
    com.apple.driver.AppleMCCSControl          1.1.12
    com.apple.driver.ApplePolicyControl          3.4.12
    com.apple.driver.AppleMuxControl          3.4.12
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.0f6
    com.apple.driver.SMCMotionSensor          3.0.4d1
    com.apple.driver.AppleSMCPDRC          1.0.0
    com.apple.driver.AppleSMCLMU          2.0.4d1
    com.apple.AMDRadeonX3000          1.1.4
    com.apple.kext.AMD6000Controller          1.1.4
    com.apple.driver.AppleIntelHD3000Graphics          8.1.8
    com.apple.driver.AppleIntelSNBGraphicsFB          8.1.8
    com.apple.driver.AppleLPC          1.7.0
    com.apple.driver.AppleThunderboltIP          1.0.10
    com.apple.driver.AppleUSBTCButtons          240.2
    com.apple.driver.AppleUSBTCKeyEventDriver          240.2
    com.apple.driver.AppleUSBTCKeyboard          240.2
    com.apple.driver.AppleFireWireStorage          3.3.5
    com.apple.driver.initioFWBridge          3.3.5
    com.apple.driver.IOFireWireSerialBusProtocolSansPhysicalUnit          3.3.5
    com.apple.driver.LSI_FW_500          3.3.5
    com.apple.driver.Oxford_Semi          3.3.5
    com.apple.driver.StorageLynx          3.3.5
    com.apple.driver.AppleIRController          325.7
    com.apple.driver.AppleFileSystemDriver          3.0.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          35
    com.apple.iokit.SCSITaskUserClient          3.6.0
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.4.0
    com.apple.driver.AppleUSBHub          650.4.4
    com.apple.iokit.AppleBCM5701Ethernet          3.6.9b9
    com.apple.driver.AppleSDXC          1.4.0
    com.apple.driver.AirPort.Brcm4331          700.20.22
    com.apple.driver.AppleFWOHCI          4.9.9
    com.apple.driver.AppleAHCIPort          2.9.5
    com.apple.driver.AppleUSBEHCI          650.4.1
    com.apple.driver.AppleUSBUHCI          650.4.0
    com.apple.driver.AppleSmartBatteryManager          161.0.0
    com.apple.driver.AppleACPIButtons          2.0
    com.apple.driver.AppleRTC          2.0
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleSMBIOS          2.0
    com.apple.driver.AppleACPIEC          2.0
    com.apple.driver.AppleAPIC          1.7
    com.apple.driver.AppleIntelCPUPowerManagementClient          216.0.0
    com.apple.nke.applicationfirewall          153
    com.apple.security.quarantine          3
    com.apple.driver.AppleIntelCPUPowerManagement          216.0.0
    com.apple.driver.AppleBluetoothHIDKeyboard          170.15
    com.apple.driver.IOBluetoothHIDDriver          4.2.0f6
    com.apple.driver.AppleHIDKeyboard          170.15
    com.apple.iokit.IOSCSIParallelFamily          3.0.0
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSerialFamily          10.0.7
    com.apple.driver.DspFuncLib          2.5.3fc1
    com.apple.vecLib.kext          1.0.0
    com.apple.iokit.IOSurface          91
    com.apple.iokit.IOBluetoothFamily          4.2.0f6
    com.apple.driver.AppleSMBusPCI          1.0.12d1
    com.apple.driver.AppleSMBusController          1.0.11d1
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.driver.AppleGraphicsControl          3.4.12
    com.apple.iokit.IOAudioFamily          1.9.4fc11
    com.apple.kext.OSvKernDSPLib          1.14
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.driver.AppleHDAController          2.5.3fc1
    com.apple.iokit.IOHDAFamily          2.5.3fc1
    com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.0f6
    com.apple.iokit.IOFireWireIP          2.2.5
    com.apple.driver.AppleSMC          3.1.6d1
    com.apple.iokit.IOAcceleratorFamily          98.7.1
    com.apple.kext.AMDSupport          1.1.4
    com.apple.AppleGraphicsDeviceControl          3.4.12
    com.apple.iokit.IONDRVSupport          2.3.6
    com.apple.iokit.IOGraphicsFamily          2.3.6
    com.apple.driver.IOPlatformPluginFamily          5.5.1d27
    com.apple.driver.AppleThunderboltEDMSink          1.2.1
    com.apple.iokit.IOUSBMassStorageClass          3.6.0
    com.apple.driver.AppleUSBMultitouch          240.6
    com.apple.driver.AppleThunderboltDPOutAdapter          2.5.0
    com.apple.driver.AppleThunderboltDPInAdapter          2.5.0
    com.apple.driver.AppleThunderboltDPAdapterFamily          2.5.0
    com.apple.driver.AppleThunderboltPCIUpAdapter          1.4.0
    com.apple.driver.AppleThunderboltPCIDownAdapter          1.4.0
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.6.0
    com.apple.iokit.IOSCSIReducedBlockCommandsDevice          3.6.0
    com.apple.iokit.IOFireWireSerialBusProtocolTransport          2.5.1
    com.apple.iokit.IOFireWireSBP2          4.2.5
    com.apple.iokit.IOUSBHIDDriver          650.4.4
    com.apple.driver.AppleUSBMergeNub          650.4.0
    com.apple.driver.AppleUSBComposite          650.4.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.6.0
    com.apple.iokit.IOBDStorageFamily          1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.iokit.IOAHCISerialATAPI          2.6.0
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.0
    com.apple.driver.AppleThunderboltNHI          1.9.2
    com.apple.iokit.IOThunderboltFamily          2.8.5
    com.apple.iokit.IOUSBUserClient          650.4.4
    com.apple.iokit.IOEthernetAVBController          1.0.3b3
    com.apple.driver.mDNSOffloadUserClient          1.0.1b4
    com.apple.iokit.IO80211Family          600.34
    com.apple.iokit.IONetworkingFamily          3.2
    com.apple.iokit.IOFireWireFamily          4.5.5
    com.apple.iokit.IOAHCIFamily          2.6.0
    com.apple.iokit.IOUSBFamily          650.4.4
    com.apple.driver.AppleEFINVRAM          2.0
    com.apple.driver.AppleEFIRuntime          2.0
    com.apple.iokit.IOHIDFamily          2.0.0
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          278.10
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.AppleKeyStore          2
    com.apple.driver.DiskImages          371.1
    com.apple.iokit.IOStorageFamily          1.9
    com.apple.iokit.IOReportFamily          21
    com.apple.driver.AppleFDEKeyStore          28.30
    com.apple.driver.AppleACPIPlatform          2.0
    com.apple.iokit.IOPCIFamily          2.8
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.pthread          1
    com.apple.kec.corecrypto          1.0

    marcocapela wrote:
    I perform a lot of hard reset
    There is no such thing as a "hard reset".
    If basic troubleshooting from the User's Guide fails to resolve the issue, then take the device to Apple for evaluation and possible replacement.
    marcocapela wrote:
    It worked very good for 2 years, i lost warranty, and i'm with this problem for 2 months and it's very annoying, and i'm losing faith in apple products...
    Warranties expire, hardware eventually fails, ignorant people live with issues for long periods of time and the above statement is simply ignorant. 

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