macOS's AWDL interface (awdl0, used by AirDrop/AirPlay/Handoff) periodically
pulls the WiFi radio off-channel. In my personal case, this causes ~12% time-based UDP downlink
loss and latency spikes, regardless of bitrate or signal quality — seen as
~15% "network" frame drops in Moonlight. TCP mostly masks it, which makes it
hard to diagnose.
Fix: disable the features that wake AWDL, and down awdl0 at boot via a
one-shot LaunchDaemon (no resident process; it watches the first 3 minutes