I have been having a strange issue where my phone is on, everything is fine, the screen goes to sleep and sometimes, when I press the power button to wake it up the screen stays off! If I press and hold the power button I feel the short vibe when the "Turn off phone" menu pops up, but the screen and buttons at the bottom of the screen are off. One time I repeatedly pressed the power button and it woke the screen back up, but the other few times it happened I had to pull the battery and power back on to get it to come back! Is this possibly related to Juice Defender? I have the Ultimate version.