Ring Doorbell 2 not ringing

Several times, visitors have rang the doorbell and we did not hear the chimes or get notified, but when we check the footage, we can see that the doorbell was pressed and the doorbell itself made the chime, but none of our chimes or phone alerted us. This has happened several times which is quite embarrassing as it looks like we are ignoring visitors or away when we are supposed to be indoors during covid lockdown.Is there a fault with our doorbell?