Computer fails to stay in Suspend/Hibernate

Hi guys, first post to this forum despite running Win7 for over a year now.

Unfortunately, the problem I'm seeing sounds similar to many other cases, but I haven't been able to find a single case that is similar to my situation.

Previously suspend would work perfectly for me, I would put it into suspend and the computer would remain. In the past few months though, the computer remains in hibernate or standby (tried both of them) for atleast an hour but no more than 8 hours before waking itself up.

Unlike other people's problems, my computer -never- wakes up immediately. It has always remained in standby/hibernate for atleast an hour or two before waking itself up again.

Things I have tried:
-Disabled all "Wake on LAN" or similar power management settings in device manager.
-Disconnect EVERYTHING so that only the power cord is connected to the computer (no wireless)
-Boot up w/o logging in and put computer into standby


All of the things I've tried do not work. I have not changed any hardware besides the addition of external HDDs which I have disconnected/power down to no avail. I have kept up to date on all Win7 updates (in spite of my "it ain't broken don't screw with it" motto)

I'm not sure how much it will help, but here is a link to my "powercfg -ENERGY" report

http://www.lenaxia.net/energy-report.html

I would again like to reiterate that unplugging -everything- from my computer and a clean boot does not resolve the problems I'm seeing.

Anyway thanks for the help
-Mike