Phantom dings from original chime

I have a Ring Pro hooked up and functioning properly along with the lowvoltage hardware to the original door chime. When someone presses the button on the Ring, the original chime dings appropriately. The issue is that periodically throughout the day the original chime gives a small single flat ding. It is not a full chime that it gives when the doorbell is pressed but is instead as if the hammer is given just enough power for a single halfhearted pull. Help please, I am unable to find anything in your help or forums about phantom dings. It really is more of a d-o-n-g sound but apparently your forums feel that is a "bad word". :laughing: