Grrrr!!!!!!! I have 5 kindle's my Tablet 4 just will not let me read my book. 1. it will not open the book i'm reading if, it does opens at wrong page then will just go away and tell it is loading my books. 3. sometimes won't even turn a page. WHY?
Have you tried restarting your Fire by holding the power button in for no less than 40 seconds?
If that doesn't work, please use the "Identify Your Device" icon at the top of this page and give us the name of the model you're using. I'm not aware of any that was sold by the name "Fire Tablet 4".