Have an IPad 1 that is the high end one. Over the past few months When i am right in the middle of reading an ebook or trying to load a game ( angry birds) or perform some other task I will get a black screen and the iPad goes back to the homepage. What is causing this as it has become very frustrating? I make sure no other programs are running and it still happens. Any idea of how to fix this? It does not happen all the time but it is becoming more frequent. Suggested solutions are welcomed.