My iPad's sound sometimes does not work. For example right now, AB and Baseball apps do not have sound. But other apps do. Multipong didn't have sound, then it crashed a couple of times and had sound again. AB doens't have sound probably 10% of the time I use it. I feel like just leaving the iPad alone for a few hours fixes the issue which makes no sense. Anyone else having issues with apps sounds disappearing off/on? How to fix it?