Ever since I got the Gingerbread update, my phone has been behaving oddly. When I push the power button to turn off the display, the screen won't respond. And sometimes I just barely bump the button and it asks if I want to shut down the phone. When I try to "wake" the phone by pressing the power button it won't wake up. (The LED light isn't flashing!) But if I plug it into the USB charger the phone wakens immediately. Can someone please explain why my phone is so difficult to use now? It take 10-20 tries just to wake the screen to use it!