Rind Doorbell 2 - not always notifying someone is standing in front of it.

Hi Folks,Ring Doorbell 2 customer here, while most of the time its working fine notifying even about cars and other objects, from time to time its not notifying about people standing in front of it even for a while like amazon deliveries and instacart deliveries (today for instance the lady dropping of the shopping parked the car in front of the camera, and did 6 runs to the car bringing the items to the door - everything is in front of the camera)Wifi is perfect.Power is perfect.Ideas?