I, too, am experiencing this odd issue. The device changes from reporting itself as an Amazon fire late model to a fire phone, always Amazon.
I definitely do not own this device, and have just moved to a new house, rebuilt my LAN, replaced my WiFi Router, and the device is still here. ***?
I should also add the device is not picking up an IP address, it's MAC doesn't appear in any of the AP or Firewall Syslogs.Edited by heuristik - 1/8/16 at 10:52pm