Folks, I think I have discovered a bug in Ipad 4. At first I thought this was something specific from Ibooks, but moments ago I noticed in Safari browser too. I don't see very often but it's there. It happens this way: in the middle of what you're doing, Ipad sends you to the desktop/main screen. You know that button which resembles a circle and that every Ipad have? It's like you pressed that button, but you did not in fact. In the Ibooks case, I have several GB from many ebooks and when I browse through all of them from bottom to top, this bug usually happens. Kinda like it's tired from going bottom to top with your finger going too fast. Did you know if this is a bug or not? I can tell you it's not very frequent but still, annoying. I use the 64GB model wi-fi only. OS with latest version.