Power mac G5 unexpectedly goes in sleep mode or shut down.

I have a very strange problem.
I was using my 2 year old G5 without any problem untill some weeks ago. Randomly it would go into sleep mode without any mesage, you could start it again by pressing any key. It would start working for a little while(minutes), but then it would freeze and either go in sleep mode again or eventually it would shut down (without any mesage). However the little light above the power button would stay on. If you don't touch the keyboard or computer it will try to start again by itself.
If in sleep mode it will just come back with the screens I was in or it will boot and try to go to login. I say try because sometime it will shutdown again before that.
It is not predictable when it will happen. Sometimes it doesn't happen for days and then suddenly two days in a row.
I thought it could have something to do with the power supply so I bought a ups power system, didn't help.
Who can help me with this?
Power Mac G5, 1.6 Ghz   Mac OS X (10.4.8)  

Thanks for the input
I did the PMU reset, but it didn't solve the problem. Two days later my computer had a nother episode.
I checked the console.log after that and didn't find any temperature messages.
I did find this:
Feb 18 08:16:28 LeoComputer mDNSResponder: Repeated transitions for interface en1 (10.0.1.2); delaying packets by 5 seconds
Feb 18 08:16:30 LeoComputer kernel[0]: AFPSleepWakeHandler: waking up
Feb 18 08:16:30 LeoComputer kernel[0]: AFP_TCP ASP_TCP SendSleepPkt: sending ext sleep wakeup
Feb 18 08:16:32 LeoComputer kernel[0]: AFPSleepWakeHandler: going to sleep
Feb 18 08:16:32 LeoComputer kernel[0]: AFP_TCP ASP_TCP SendSleepPkt: sending ext sleep
and later:
Feb 18 08:19:19 LeoComputer mDNSResponder: Repeated transitions for interface lo0 (127.0.0.1); delaying packets by 5 seconds
Feb 18 08:19:22 LeoComputer launchd: Server 0 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[227]: exited abnormally: Hangup
Feb 18 08:19:22 LeoComputer configd[43]: posting notification com.apple.system.config.network_change
Feb 18 08:19:22 LeoComputer lookupd[232]: lookupd (version 369.5) starting - Sun Feb 18 08:19:22 2007
Feb 18 08:19:24 LeoComputer mDNSResponder: Repeated transitions for interface en1 (10.0.1.2); delaying packets by 5 seconds
Feb 18 08:19:28 LeoComputer kernel[0]: AirPort: Link DOWN (Client disAssoc 0)
Feb 18 08:19:28 LeoComputer lookupd[235]: lookupd (version 369.5) starting - Sun Feb 18 08:19:28 2007
Feb 18 08:19:28 LeoComputer configd[43]: posting notification com.apple.system.config.network_change
Feb 18 08:19:28 LeoComputer launchd: Server c50f in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[235]: exited abnormally: Hangup
Feb 18 08:19:28 LeoComputer lookupd[236]: lookupd (version 369.5) starting - Sun Feb 18 08:19:28 2007
Feb 18 08:20:19 LeoComputer kernel[0]: System Sleep
Feb 18 08:20:19 LeoComputer kernel[0]: System Wake
Feb 18 08:20:19 LeoComputer kernel[0]: Wake event 0020
Feb 18 08:20:20 LeoComputer kernel[0]: USB caused wake event (EHCI)
Hope this makes any sense to somebody

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