I just got the black PDN and every time I turn it off, it powers back on. Sometimes it'll turn back on in 10 minutes, sometimes an hour. I tried unsuccessfully to do an update hoping that may solve the problem. Everything seems to go smoothly thru the update, but when I get to turning off the PDN, then pressing volume+ & power button and holding, it will not show a progress bar uploading the update. In fact nothing happens. My Mom got the same unit so I tried everything with hers.....same thing! It turns itself back on and won't take the update. Any suggestions out there would be greatly appreciated!