Sleep function made deficient and not accurately

Overall, the Case is perfectly fine for the price. Of course it is annoying when more is being touted as possible. The Sleep function on my Kindle works 1/10 cases. However, unfortunately, not an isolated case, since my sister had recently bought the same envelope and has exactly the same problem. Also, the Kindle does not fit purely perfect, so that the screen edge is not parallel to the shell edge. I was offered to repair it or exchange. But as the Proto to England is not too little, the question is of course whether it is worthwhile (and since my sister got Case also a defective Sleep Funtkions, I doubt that it is an isolated case).

Would Case touted without sleep function, so it would get from me more stars.