troubleshooting Question

Fedora 15 Randomly Reboots

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ro6otFlag for United States of America asked on
Operating SystemsLinuxLinux Distributions
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I installed F15 on a new build:

Intel Core i7-950 LGA1366
EVGA 131-GT-E767-TR (motherboard)
CORSAIR Vengeance 12GB DDR3 1600 (RAM)
650W PSU

First couple of weeks, everything ran smooth. A couple days ago the system started rebooting. It started to randomly reboot while I was working on file conversions in a XP virtualbox VM. I spent sometime troubleshooting vbox only to discover that my system will also reboot when ever I unrar a file with "unrar". The reboots have also happened while I was browsing with Firefox. The message log doesnt always generate a log entry either.

This is the last message log entry before the most recent reboot:
Sep 9 16:24:53 machine dbus: [system] Successfully activated service 'org.freedesktop.PackageKit'

I think its the last entry because it follows the entry below:
Sep 9 16:26:31 machine kernel: imklog 5.8.2, log source = /proc/kmsg started.

A couple of days ago this was the last entry before the crash:
Sep 6 19:06:42 machine kernel: [ 1293.903698] CE: hpet increased min_delta_ns to 20113 nsec

my current kernel is: 2.6.40.4-5.fc15.i686.PAE

Any suggestions??? Not sure (at this point) if my issue is software or hardware related.
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