Yeah, the iPad Air 2 disconnects here too. I should have been clear. When I said 5Ghz hasn't crashed I meant literally that - radio goes off the air and router needs a reboot, that was what was happening on Merlin .55 and .54. It's a bit early to say as sometimes it could take 2-3 days for the crash, but normally it was within 24 hrs, so looking hopeful.
Still, though, as we have discussed elsewhere, although I am sure the disconnects are down to something Apple have done, I don't think it is affecting other 5Ghz wifi chipsets or we would be hearing more complaints. I think this is a change that Quantenna should be able to deal with and are not.