Most Helpful Guy
looks like others have had this issue too. here's what i found: forums.xbox.com/.../1637649.aspx
"Just to double check:
Are you using your console in the Instant-On power mode?
Have you enabled your console to auto power off after a period of inactivity?
One thing I would recommend trying:
Turn off your console completely by holding down the power button for ~5 seconds
Unplug your power supply from the wall and console.
Leave everything unplugged for about 5 minutes
Plug everything back in and turn your console back on"