I made the mistake of upgrading before reading reviews. I am having problems with several apps that I never had before. For example, I read A LOT of Kindle books. Now, kindle is stuck at the "get Kindle" screen, which directs me to the play store. when I go to upgrade the app, it says I have insufficient storage. I have plenty of storage left on my phone, approximately 9 gigs. So I hit open, and it goes back to the "get kindle" screen. frustrated. other apps either don't respond or are glitchy when they never were before. Am i doing something wrong, or is the upgrade just this bad? Can I get my "old phone" back, meaning can I go back to the old os? thanks for any help you can give me!