Mac Pro shuts down instead of sleeps.

I run a 2008 Mac with OSX10.5.8, with 2GB memory and 2x2.8Ghz Quad core processors
It works great! however recently it has started acting strangely. What i mean is it normally goes into sleep mode after 15 mins of inactivity or so.
However recently it sometimes seems to shut down after a period of inactivity .... Is there a setting which has somehow been changed or is it the signs of a more serious issue?
Any help appreciated!

Hopefully post stll being checked. I have just started to have the same issue with my Mac Pro 2008. It seems to be shutting down and starting fine but the last few times I put it to Sleep, it will eventully shut down on its own. Restarts fine with no message of on screen of improper shut down. I have: reset SMC, zapped Pram, checked Console. Will run Disk Utility this afternoon.
I can put it to Sleep and Wake it again with no problem. However, it seems after a longer time in Sleep mode is when I may have a problem
I shut down last night at 6 PM. When I Rebooted this morning (it had shut down) I can see Console notes a Sleep failure code and Improper shutdown detected but this is noted this morning when I am rebooting it.
4/10/12 10:51:48 AM kernel systemShutdown false
4/10/12 10:51:48 AM DirectoryService[11] Improper shutdown detected
4/10/12 10:51:58 AM mDNSResponder[18] mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13) starting
4/10/12 10:51:59 AM configd[14] Sleep: Platform Failure - AC
com.apple.message.domain: com.apple.powermanagement.sleep
com.apple.message.signature: Platform Failure
com.apple.message.result: Failure
com.apple.message.uuid: 62D550E5-3507-4449-88FE-F86A6234C40E
Any suggestions? Am I faced with a hardware or software problem here?
Thanks
Mac Pro Early 2008, OS 10.6.8, Quad-Core, 2.8 GHz, 16 Ram

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