Computer restarts when I shut it down

Hi everyone,
I don't know if anyone else has this, but once in a while, when I shutdown the computer, it actually restarts.... First I thought it was my error, selection reboot instead of restard, but.... I closely looked at what I was doing and it restarted. My brother has the exact same iMac, with the exact same configurations and his does it too.
I upgraded to 10.7.2, and repaired my priveleges just to make sur and still....the same thing.
Can anyone provide a fix for this?
Thanks.

kpott, while I can't offer a solution (yet, still researching), I can confirm the issue -- ever since I upgraded my mid-2010 Mac Pro to Lion, it too will restart instead of shutdown every once in a while. I have not been able to establish a pattern for when/why it happens, nor can I reproduce it reliably. Here are my observations so far:
This machine had various versions of Snow Leopard (10.6.x) installed, this issue never occured before installing OS X 10.7.x
The issue only occurs on this computer not on any of the other various Macs in my office/household
The issue occurs (randomly) regardless of whether I choose "Shut Down..." from the Apple menu or whether I use the keyboard shortcut "Ctrl-Eject", and click in "Shut down" or use the keyboard to select the same option
The issue first occured after upgrading the machine to 10.7 from 10.6.8. Thinking the upgrade process got mangled I did a "virgin" install but the problem remained.
I exchanged the hard drive for a newly purchased SSD and did another "virgin" install, still the issue reoccured.
I reset the SMC several times, cleared PRAM, verified the boot volume, created new users, repaired permissions etc., etc. -- nothing helps (so far)
This is one pesky bug...

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