I'm not sure what I did (or did not do) that ends phone calls when I press the Lock/Unlock button (on/off button also). This happens when the screen goes idle from talking on the phone for few minutes. When I try to revive the screen by pressing the lock/unlock button, it ends the phone call instead of just reviving the screen! I don't get it and REALLY annoying. My wife and I got the same phone at the same time and I'm the only one experiencing this abnormal behavior. Could my bluetooth headset device causing this? My wife had one already but I'm using the crappy one that comes free with Costco sign up. Has anyone experienced something similar? I would appreciate any suggestions for me. Thanks in advance!