Have a 2014 Mini running 10.13.6 and recently installed the firmware updates on my two AEs, which are connected to 5Ghz WiFi network. I have Mini connected to an ancient Onkyo 5.1 receiver via optical, with two fronts, two rear, and a sub. Previously, everything worked fine. Connecting to both AEs was quick and trouble-free. After the update, connecting is slooooow, iTunes displays wonky playback controls in the AirPlay menu that then disappear as you connect (still don't understand point of them), audio to AEs goes out of sync frequently, and even worse, I swear when I stream audio through the AEs, it kills the levels on the Mini's output (ie, weak bass and no high-end). Anyone else have these issues or heard of them? (mods, if this isn't correct location for topic, pls move) Thanks!