I just got a replacement Droid, as the first went crazy in the heat and humidity. When I dial on this new one, and put the phone to my ear, the screen goes dark. However, when I lower the phone to enter more numbers, etc it stays dark!! I tried using the on/off switch but it does nothing. If I slide out the keyboad, the screen lights up for a second, but not long enough to use the keypad. I have the timeout set for a minute. Ideas?