Hi I am trying to close apps as I have been told this will help prolong battery life. I bring up the bottom bar by double clicking, hold down the app to make it wiggle, the minus sign appears to close the app but it won't close when I select the minus sign. I have powered on and off a few times but this doesn't fix it and still can't close the apps. A few have suggested to reset all settings but am unsure what else will be effected if I do this. I have recently updated to 5.1.1. Anyone know how to make the wiggle apps close please? I don't want to delete them, just close them. Thanks so much.