Are these sentences natural to a native ear?
1. Does it ever happen with you that one part of your screen goes dark?
2. Does it ever happen with you that you get up from sleep and not able to walk?
3. I am not adding anything of my own; that is what the book says. ( I was trying to say that everything I said was from the book)
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.