Форум HARDUINO

On two ATS25 devices (one modificated and one homemade) with the latest software, I experience an annoying, approximately 7-second beep when switching them on. Is this normal, or what kind of errors could be causing it? The clock signal is generated by the Si5351. All other functions work perfectly. Both ICs (Si5351 and Si4732) are also recognized immediately upon power-up.
Thank you for your reply!