Still no luck with my Ipad Air 2 and the current IOS version. H9s are upgraded as well.
The Bluetooth connection to a device is managed entirely by iOS. We had filed a bug report with Apple about the issue and submitted Bluetooth logs to them in the hopes that they would be able to figure out the problem and fix it, but this problem has gone unaddressed by Apple for a few years at this point.
Here are two similar threads in which some users have figured out a workaround, which might be useful to you.