I have an iPad Air 2 64GB now running iOS 8.3. I've experienced problems where when using Keynote on my iPhone 5S to remote control a keynote presentation on my iPad, the connection will be dropped at random times during the presentation. I attributed this to Keynote bugs, but then my iPad also started randomly losing connections to my Logitech Ultrathin keyboard cover (the onscreen keyboard would appear) or I'd type a certain character and it would start repeating ad infinitum. I removed the interference factor from the equation by noticing that the problem would also occur within my office with thick walls and no bluetooth devices nearby … so I had Logitech replace the keyboard, but the connection drops still occur. I also reset all settings on my iPad, which didn't help.
So my next question is this: could the bluetooth hardware on my iPad Air 2 be flakey? Everything else about it works fine.