I am also having sound issues. I have no audio at all. Once in a while I get keyboard clicks, but only sporadically. I have tried a reset, I've checked that my mute button is not on, I have tried changing the "lock rotation / mute" button.
When I switch the mute button to mute and then back again, the volume icon shows for a few seconds (although it does not respond) and then disappears. All the time I was typing this there were no clicks except for a few at the end of "sporadically" and a few more at "...although it does not respond...).
I played a you tube video from my FB account and the sound would play for about 2 or 3 seconds and then stop. The video would continue for a second or two then it too would stop. When I restarted the video, the same thing happened (a couple of seconds of audio then video but no audio for a second, then complete stop.
When I play a YouTube video from the you tube app, there is no sound whatsoever, and the volume icon does not appear when I toggle the volume button.
I'm starting to think this is an internal hardware problem rather than a software issue.
We have 5 apple devices including this iPad and this is the first time I've ever had a problem that couldn't be solved with a restart or similarly simple solution.
Any thoughts?