I've read about a "sleep of death" and thought I read it was fixed. Has anything like this ever happened to anyone on this forum? Thursday night I upgraded to 8.1, put the pro on the charger, turned it off and went to bed. Friday after work I turned it on to check the new features, changed my lockscreen pic and pressed the button to sleep so I could see if I liked the new pic. I pressed the button to wake, heard a vibration, saw a brief flash and the screen went black. Nothing would wake or turn it on. I removed my SD card, tried holding the power button endlessly, called Microsoft and followed the techs instruction to hold both power and volume down (to reset battery) etc. to no avail. A return /exchange was set up. I was getting ready to pack the pro and before pulling off my Ghost Armor I stubbornly tried turning it on again. It booted. So far it has not happened again and I really don't want to go through the hassle of an exchange. I'm a grad student, taking online courses and it would be a real hassle (both the wait and the reloading my programs). Plus a return at this point means I almost certainly get a refurb. I called to cancel the RMA and the tech I talked said he thought I should return anyway, after backing up my files. He seemed to think I might have a loose battery connection. Any thoughts?