MacPro shuts  down in sleep mode

MACPRO 3.1 2x 2.8 Quad core Intel Xeon  8GB Ram ATI Radeon HD 5770 Mac Cinema HD 23 inch OSX 10.6.8.
If I allow or select sleep mode through either keyboard shortcuts or apple menu it immediately shuts down I can keep it running but half asleep (screen at rest ) if I have an app using the internet for example Safari using radio stations ; if however there is no app using the internet then the computer will shut down when sleep mode kicks in.
This seems to be a resent phenomena I have changed the graphics card from a Nvidia since the Nvidia was dying ( occasional freezes and wavy faint blue horizontal lines) although the sleep problem surfaced before swapping cards; I am not sure whether this is a hardware issue or a combined software hardware issue.
Anyone else having similar sleep problems ?
The computer is working fine apart from this one issue.
We are in the midst of summer here so the room temperature is an average of 30˚C at the moment can this have anything to do with the sleep issues?

Power or other problems related to unexpected system sleep, shutdown, lights or fans justify an SMC reset. Read all the steps.
Before Resetting the SMC
Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.
Press Command + Option + Escape to force quit any application that is not responding.
Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosing Sleep. Wake the computer after it has gone to sleep.
Restart your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Restart.
Shut down your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.
Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
After completing the above please determine if the problems also occur in "Safe Mode":
Safe Mode or "Safe Boot" is a troubleshooting mode that bypasses all third party system extensions and loads only required system components. Read about it: Starting up in Safe Mode
You must disable FileVault before you can start your Mac in Safe Mode.
Starting your Mac in Safe Mode will take longer than usual, graphics will not render smoothly, audio is disabled on some Macs, and some programs (iTunes for example) may not work at all.
Merely starting your Mac in Safe Mode is not intended to resolve the problem, it's to observe its performance without certain additional components.
To end Safe Mode restart your Mac normally. Shutdown will take longer as well.

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