Has anyone else had thier droid freeze up, with the only way to correct it is to pull the battery? My droid is doing that several times a day now. When I push the button on top to activate the touch screen, the back light comes on, and the buttons on the bottom light up, but the main screen remains dark. Then I have to pull the battery. And sometimes, the touch screen comes on, but won"t respond, and I have to pull the battery. It did both those things 3 times last night in a span of 4 hours. Any suggestions?