Some applications aren't ended completely when your tablet returns to the home screen. They keep running in the background unless you end them from the list of active applications.
End active applications
Return to the home screen
Tap the Home key twice.
At the bottom of the display a list of active applications is displayed.
Tap and hold any menu item until the menu items start to jiggle.
Tap the end application icon to end the required application.
Tap the Home key to return to the home screen.
*Please refer to the Apple website for more information or further support.*