Hello my name is***** do not rate until we are finished. I look forward to assisting and am very sorry to hear that you are having this problem. I want to warn you that it is possible you will need to replace a part in order to fix this. There are a few different things that can cause this and a couple different parts so we would need to troubleshoot to find out for sure. What model is this? Have you considered doing a factory reset? You would need to re-download your books, reconnect to WiFi etc after but if it is a software issue this could fix it.