Since I purchased them, I have both my BlackBerry and my wife's BlackBerry set to power down at midnight and power on at 6am. Within the last week, neither one is shutting down at the set time. If I manually shut them down, they power back on correctly, but the power down function seems to have stopped working. I have tried a battery pull and I have also reset the times but nothing seems to help. Any thoughts on this? They are BlackBerry Curves by the way.