Has this issue been resolved? If so what was the resolution?

Well, we submitted multiple Bluetooth device trace logs to Apple, and they made a change in iOS 8.3 that fixed the problem for some users but not all users.  Then, we sent them 3 H9s to test with, and I'm hoping that they might have changed something in iOS 9 to address the problem.  But we haven't heard from anyone that after upgrading their problem was resolved.  But in any case at this point we've done everything we can to provide information about the problem to Apple, and we're waiting for them to address it.