Repost --powerbook G4 15 inch still shuts down and restarts randomly.

Question

This is a repost. I am still having problems with my 15 inch powerbook restarting itself randomly. It happens all the time and I lose everything that open/running at the time. It goes back to the login screen and when i log back in, everything is shutdown/lost. HERE is the last log after the crash/shutdown.
Any solutions?? power supply??
Thank you.
Aug 26 19:44:14 usbmuxd280: ClientResult send to 0x3011d0 failed: 32 - Broken pipe
Aug 26 19:44:18 mDNSResponder: NAT Port Mapping (W8418764QHY.ttp4daemon.tcp.484312966458654.): timeout
Aug 26 19:45:35 kernel[0]: AirPort: Link DOWN (Client disAssoc 0)
Aug 26 19:45:40 configd52: posting notification com.apple.system.config.network_change
Aug 26 19:45:43 lookupd306: lookupd (version 369.5) starting - Sun Aug 26 19:45:43 2007
Aug 26 19:47:19 kernel[0]: REPORT_KEY failed : ASC = 0x6f, ASCQ = 0x01
Aug 26 20:42:35 ntpd156: sendto(17.254.0.31): Can't assign requested address
Aug 26 20:51:09 /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow: Login Window Application Started
Aug 26 20:51:12 loginwindow842: Login Window Started Security Agent
Aug 26 21:45:53 kernel[0]: AirPort: Link Active: "xxxxxx" - 0011f55c63e6 - chan 1
Aug 26 21:45:53 configd52: SecKeychainFindGenericPassword err= -25308 ( =0xffff9d24, secErrStr=User interaction is not allowed. ) (current=)
Aug 26 21:45:56 configd52: posting notification com.apple.system.config.network_change
Aug 26 21:45:57 lookupd906: lookupd (version 369.5) starting - Sun Aug 26 21:45:57 2007 Aug 26 21:45:57 configd52: setting hostname to "unknown-
4-4d.lan"
Aug 26 21:46:28 mDNSResponder: NAT Port Mapping (W8418764QHY.ttp4daemon.tcp.484312966458654.): timeout

Answer 1

Cornelius:
Thanks for the info. Today I was not connected to the internet, i had my sys preferences set to never sleep, never screen saver and about half way through ripping a DVD with handbrake, my powerpc G4, was back at the login screen!! I logged back in and everything was gone/shut down. I had a half ripped movie and all programs were shut down? Today I also ran apple hardware tests from the disk, techtool pro 4 and everything passed so i dont know why this keeps shutting down?? Is there anymore tests i can run from the OSX tiger disk? Heres what the console and sys log looked like after the restart:
Console:Mac OS X Version 10.4.10 (Build 8R218)
2007-09-03 17:45:29 -0500
2007-09-03 17:45:30.411 loginwindow[1385] FSResolveAliasWithMountFlags returned err = -43
2007-09-03 17:45:30.412 loginwindow[1385] FSResolveAliasWithMountFlags returned err = -43
2007-09-03 17:45:38.231 SystemUIServer[1399] lang is:en
Sys:
Sep 3 17:39:17 -Computer /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow: Login Window Application Started
Sep 3 17:39:21 -Computer loginwindow[1385]: Login Window Started Security Agent