Ever since I bought the phone up until recently, every 72 hours, it would have me enter my password in order to unlock it just as a security check. I'm sure many people find this annoying, but I actually kind of appreciated the purpose that it served. All of the sudden, though, it's not asking me anymore. I don't think I changed any of the settings, so I find this kind of strange. Does anyone know why it might have stopped doing this and how to get it back? Thank you.