I'm having some odd issues with my D2G. When I lock the screen it turns the display off as it should initially. However, it will turn the display back on at random, stay on for about 10 seconds and turn it back off only to turn it back on about 10 seconds later. It does this about five or six times and then stops. And a random interval later it starts it again. Any ideas as to what is causing this and how to stop it?