Ok, I know this is probably the most common newbie question, but i'm not a newbie, and I've checked most obvious reasons, but My Samsung galaxy S4, 4 months old, never let battery completely die, no apps running, minimal screen time (2min max today so far) is draining the battery way more quickly than usual. Took phone off charger at 7am, now its 10am and battery is at 75% and I have not used anything on my phone. Again, no apps running today. I have only lit up the screen for seconds at a time to check the battery life percentage. Up until 3 days ago it would never do this. Battery usage indicates the majority of battery is being used by "Device Idle" 35%, and "Android OS" 17%. Since I have not even used my phone today, the screen used less than 5% so far. ???? Also, I am connected to WiFi with excellent signal, same as always, as well as good 4G signal, as always. WHy the sudden change in battery drainage? This started Monday, and I haven't downloaded anything in about a month. Rebooted, no change. Pulled Battery, no change. Advice? I am beginning to think this is a conspiracy. ha. thanks in advance.