Why does my Mac Pro 2013 stop responding after being idle?

My new 2013 Mac Pro works great, but when I've left it idle for a few hours, it refuses to wake up.  The monitor goes completely dark, and it doesn't respond to keyboard or mouse events.  The computer is on: the fan is blowing and the power button is lit, but it seems completely inactive.  I've tried disconnecting and reconnecting the monitor, disconnecting and reconnecting the keyboard, plugging the keyboard directly into the tower, unplugging the monitor's power supply and reconnecting it.  I've also confirmed (by plugging it into a MacBook Air) that the monitor itself is in working order.
So far the only way I've found to make the computer usable again is by forcing it to turn off (by holding the power button) and then turning it back on, but obviously I'd prefer a less destructive solution.  Anyone else experiencing this?

The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

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