I don't know what's going on here, but I had charged my phone to 100% and just before going to bed, I took it off the charge. I woke 8 hours later, looked at the phone, 49% battery!!! I mean what the hell?! It dropped over. 50% overnight, it's never done that. I looked at the usage details and it showed that there was 3 hours of usage on the phone during that 8 hours. I don't know what happened but that's unacceptable. I've tried doing all the things people have suggested, such as doing a restore then setting up as new, resetting settings, do a few full drains and full charges so I don't know why that happened. It's funny though because till this day, it's been fine. I can leave it overnight and see maybe a 2% drop, that's why I'm so blown away at this. You guys think this is a battery issue or a software issue? Should I bring the phone to an apple genius?