I got a black lumia 920 and it tends to freeze up when using it while charging, especially when unlocking the phone (the background would not slides up all the way, after that the screen does not respond), I'll have to press the power button to turn off the screen and press the power button again to turn it back on to unfreeze it. I'll have to unfreeze my phone at least one time every time I use the phone while charging. The phone works fine when it's not charging. Does anyone have any idea how to solve this problem?