MacPro requires Restart alot

Ok;   my Mac Pro, INTEL  I bought 4 .5 years ago.  It recently does this-  if I leave the computer for 40 minutes or so...my power button starts blinking..and everything freezes up.  Not even Command/Option/ESCAPE will  'wake up the computer.   I'm required to 'press and hold power button to SHUT down...then, re-start.   Never did this before.   Only the last 6 weeks, and it's annoying. Someone at a Mac store said this could be a 'hardware issue-- is it?      I've done 'disc Utility..and Repair Disc and all that- it's all fine. But WHY the restart constantly?? thanks! L in NYC    oh btw; I'm on Snow Leapord  11. something.

You ran the full AHT test and the probelm didn't appear while running it?  Do I assume then it took less than your 30 minutes to run AHT?  Is that a "reliable" 30 minutes? If so perhaps wait long enough before starting the test (answering its prompts) so that the tests are running across that 30 minute mark.
Maybe something is overheating.  You might want to add one of the temperature monitor utilities.
Hardware Monitor
iStat Menus
Temperature Monitor
iStat Pro
iStat Menus and Hardware Monitor is particularly useful in that they will also show you power consumption (watts, volts, amps) of various components.  If your power supply is going then perhaps these readings would reflect that.  FWIW, my personal preference is IStat Menus.

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