Ive had my bionic for almost 2 weeks now. Not rooted, standard batter and its happened to me 4 times. All 4 times were when the phone was in my pocket. I was wondering if maybe the buttons were getting pushed in a certain order that was making this happen, but from what Ive read, that dosent seem to be the case. My led always seems to be flashing green, but phone wont respond. I have to pull the battery to get the phone to boot back up. Each time, it takes me a while to even notice that the phone has locked up. Ive never seen when it happens and only discover it when I pull it out because it seems like its been a long time since I have recieved a notification for something.