Hi' Please visit this link http://www.satechhelp.co.za/8890/Sonitec-S7200-Downloading-Apps-Reset and refer to the second solution.
Option two: Go to settings=> Security=> App permissions and turn it on. Let us know if your tab does not have this option. With this option turned on' your tab will ask for permission for every app that works on backround. You will have an option of denying and accepting.