Garageband asking to use AirPlay interrupts recording.
Garageband 6.0.5, which was shipped with my new iMac, has started randomly interrupting a recording in progress to tell me that it has identified AirPlay available on the computer. An attention window appears and asking if I want to select AirPlay for the Garageband output and the recording is paused. This is unnecessary and annoying as well as ruining recordings.
In Preferences>Audio/Midi I've already selected "Built-In Output" (AirPlay appears as one of the options on this list).
Any ideas what settings I've missed or how I can stop Garageband from asking me if I want to use AirPlay?
Thanks