Computer shuts down randomly W/O warning User32 event ID 1074.

I've got a dell DT connected to our domain thats rebooting randomly, after taking a look in the event log I found the following:

The process C:\Windows\system32\winlogon.exe (BGR-PLAY-DT-06) has initiated the restart of computer BGR-PLAY-DT-06 on behalf of user NT AUTHORITY\SYSTEM for the following reason: No title for this reason could be found
Reason Code: 0x500ff
Shutdown Type: restart

Log Name: System
Source: User32
event ID: 1074
level: information
User: System

The computer does not blue screen it just simply shuts itself down.

Thanks for the response!

The machine is brand new out of the box from dell so less than 2 months old, recently imaged and deployed. the reason why I've been steering away from considering this a hardware issue for 2 reasons, the first being if it were the motherboard failing or a bad stick of ram wouldn't the machine BSOD and not do a clean reboot? And if it was a bad psu wouldn't the machine just simply lose power? Also I ran through the dell diagnostics and the only thing that reported faulty was the cdrom drive which is non essential.