My tab keeps rebooting every 20-25 minutes. I have tried clearing the cache as well but no results. I don't want to factory reset because I have some books app that are not available anymore on play store or any other store. Is there a way around it? Anyway I can fix my tab without factory reset? I don't want to rest and have that app and the books it can cleared. Is there any backup which is easy and can backup my books app (which is no longer available on any store) without losing the books? Please help me.