I had an issue with my new D3 and was sent a refurb, I didn't want a refurb, because I paid for a new one. But when I got it, it looked brand new, so no biggie. However, the issue I had with the first one was that when I connected it to my pc, it locked up and the screen wouldn't respond to anything I did. Tried resets, battery pulls, power x method, it went to the setup screen with andy and "touch screen to start" but that was it. One problem I've had with the replacement is every now and then I get a random reboot and the battery life seems a little less than the first one. I'm thinking that there are more than likely some apps that are not compatible but have slid under the radar. Also, the cam app, if I close out of it with the power button and then go back to it, I get this weird green effect to the screen for a few minutes, then reboot by itself.
I will continue investigation, and repost when I figure it out.