This exact bug has happened to my only when ive rebooted after either having it in airplane mode and trying to reboot or not having a signal at all. I have a cigarette app. that does the same...something to do with phone signal. it does fix after that(signal). when i plug mine in for usb or picture/music transfer and it doesnt charge to 100% it says reading..(in accuracy part) til i plug it in for the duration(100%). I love this app. though it is so interesting!!