Did you close the app properly?
You'd be surprised how many people leave tones of app open in the background without knowing.
On my iPhone most people know to double tap the home button to bring up a list of open apps then swipe up to close them, but they can still run in the background. Most need the settings altered but others can be cleared by holding the the power button until the swipe to turn off comes up, then let go and hold the home button until the screen flashes back to your home screen.
My android tablet is pretty similar, double tap menu then swipe to close but to stop them running in the background I use an app-killer app.
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