Have not heard a chirp. Does it happen during down time, processing time, power up, power down? I will listen for it and report back.
I did run into some remote (iPad) connection problems when I started auditioning DACs. The iPad would lose connection and I could not do any DAC setup. Had to reinstall the core several times.
I tried an RME ADI2, Lynx Hilo, AudioQuest Cobalt, ADL GT40, and a Chord Qutest. The Chord was the clear winner in my system which consists of vintage McIntosh tubes and Klipsch horns. The connection is now stable with the Chord.