My iPad seems to have a problem that happens quite a few times a day. Sometimes it can happen up to 5 times in a row before I can view a webpage on safari for more than a minute Basically when I have Safari open. Or any other app for that matter. The screen goes black for a second or two and then it goes back to the home screen. Any ideas of what is causing this or how to fix it? I don't really want to upgrade my iPad until the next one comes out.