After using the system for a few hours, whatever I am doing, whether it's a game or an app, will crash. Upon restarting the app, the crashes will happen more and more frequently until eventually they won't even start up at all and will crash after hanging on the logo for a while. Same thing happens for basic console functions like the friends "app" and achievements "app".
I'll walk up to the system to press the button to power it off, but the light will blink on and off slowly for a few seconds, and then stay on. The Kinect light and Controller light also stay on. No video is sent to the tv. Pressing the power button on the
controller or Xbox during this state does nothing - system is effectively bricked. One time I tried to say "Xbox on" but the Kinect light shut off as soon as I started talking, and turned on a few seconds later. What the hell is up with that?
Unplugging the PSU is the only thing that works at this state. After that it does the long boot and I can run games and apps normally for another few hours.
What on EARTH is going on...