My wife has an iPP, 12.9. Works flawlessly, that is until today! All sound is gone. No beeps, no clicks, no dings. We've turned sounds off and on, keyboard clicks, adjusted volume to the max, rebooted, turned off and back on, and still nada. I can't find what the heck happened. She uses it all day long to text, message, email and games. It resides in a stand all day, never dropped. Any ideas?